PADI & TDI Technical Dive Sites

Horizon Divers – Dive Courses

At Horizon Divers, we offer customizable packages for Florida technical diving at more than 100 dive sites. One of the only technical diving facilities in Key Largo, Horizon Divers is the premier PADI, TDI, and IANTD technical diving facility in Florida.  We provide everything you need to make your dream adventure a reality. Horizon Divers has everything you need for a great technical dive, including training, custom charter trips, and equipment sales and rentals. With some of the best wreck dives in the word, our long compression divers can explore a variety of wrecks, including those at 180 to 300 feet. Contact Horizon Divers for more information our technical diving classes, dive sites, and scuba training. Check out our trip report for the latest tech adventure.

Technical Dive Sites
Wreck Depth
Spiegel Grove 65′-140′
Eagle 70′-110′
Duane/Bibb 70′-130′
Doc deMille 90′-150′
Northern Light 150′-190′
Whistle Buoy Wreck 180′-220′
Scott Mason-Chaite 200′-260′
Queen of Nassau 180′-220′
Vitric 290′-300′

Technical Diving Photo Gallery

CoursesEquipmentWhy Horizon Divers

For those divers that have always wanted to stay down longer or go a little deeper to explore your favorite wreck or reef, you have come to the right place for your technical training. We offer a wide variety of training from Intro to Tec all of the way though to Trimix. The Advanced Wreck Penetration class also is available. We offer technical level classes from PADI, TDI and IANTD.

View our available courses and class descriptions below.

Custom blend Nitrox and Trimix fills are available in either our rental double AL 80cu tanks or your own personal tanks. We offer a full range of rental equipment. This includes, double AL 80cu tanks, AL 80cu and AL 40cu deco/stage bottles, back gas regulator kits, stage regulators and N-19 Silent Submersion Scooters. All of the gear needed for your technical gear kits also is available for purchase.

Choose Horizon Divers! As one of the only technical diving facilities in Key Largo, Horizon Divers provides everything you need to make your adventure a reality. Our experienced and knowledgeable crew work as a team to support your extreme diving experience. Your safety, along with your enjoyment, is our top priority. Our highly trained staff can serve as safety divers and technical guides, if needed.

PADI Tec Diving Courses

Tec 40Tec 45Tec 50Tec 65DSAT Tec TrimixDSAT Gas BlenderAdditional Courses

PADI Tec 40 Diver

Horizon Divers – Dive Courses
Course Description

The first step to going beyond the recreational diving limits. TEC 40 divers learn the basics of decompression diving and accelerate their decompression with higher mixes of Oxygen. Upon completion divers are trained to a maximum depth of 40m (130’), using two gas mixes up to 50% Oxygen, with a max decompression of 10 minutes. Divers can opt to take this course using a single tank, but doubles are recommended and encouraged.

Class and Dive Schedule

Course Outline
Day 1 Classroom, Paperwork and Gear Setup
Day 2 AM Confined Water Training
Day 2 PM Dives 1 and 2
Day 3 AM Classroom & Dive Planning
Day 3 PM Dives 3 and 4
Day 4 AM Final Exam
Day 4 PM Dives 5 and 6
Pricing and Reservations

PADI Tec 40 Diver Course

• $800 per Person

Dive Equipment

Provided
• Tanks, weights, gas fills

Required
• Mask, fins, Back-plate, wing, regulators x 3, dive computers, dsmb, reel & finger spool, thermal protection, flashlight, dive planning software
• See course description sheet for more specific equipment requirements

Rental
• Students can rent all required equipment for training.
• Cost: $75 per course

Prerequisites

• At least 18 years of age
• Minimum Certification: Advanced Open Water, Enriched Air / Nitrox
• Minimum Dives: 40 total logged dives, 20 nitrox dives, 10 dives deeper than 100’
• Medical statement signed by physician in past 12 months

PADI Tec 45 Diver

Horizon Divers – Dive Courses
Course Description

Go further beyond your limits with the TEC 45 diver course. This course is the PADI extension of the TEC 40 course, and often taken at the same time. Students will expand on skills learned during their TEC 40 training. Upon completion divers are trained to a maximum depth of 45m (145’), using two gas mixes up to 100% Oxygen. Divers are required to take this course using doubles.

Class and Dive Schedule

Course Outline
Day 1 AM Classroom, Paperwork and Gear Setup
Day 1 PM Dives 1 and 2
Day 2 AM Dives 3 and 4
Day 2 PM Classroom and Final Exam
Day 3 AM Dive 5
Pricing and Reservations

PADI Tec 45 Diver Course

• $500 per Person

Dive Equipment

Provided
• Tanks, weights, gas fills

Required
• Mask, fins, Back-plate, wing, regulators x 3, dive computers, dsmb, reel & finger spool, thermal protection, flashlight, dive planning software
• See course description sheet for more specific equipment requirements

Rental
• Students can rent all required equipment for training.
• Cost: $75 per course

Prerequisites

• At least 18 years of age
• Minimum Certification: PADI TEC 40 Diver, Rescue Diver
• Minimum Dives: 50 total logged dives, 20 nitrox dives, 10 dives deeper than 100′
• Medical statement signed by physician in past 12 months

PADI Tec 50 Diver

Horizon Divers – Dive Courses
Course Description

Deeper, longer, & more complex is the name of the game at the TEC 50 level. Experienced TEC 40 & 45 divers push their limits and max depths. Narcosis, extended decompression times, situational awareness, skill, and muscle memory are all parts of a 165’ technical dive. Upon completion divers are trained to a maximum depth of 50m (165’) using two gas mixes up to 100% oxygen.

Class and Dive Schedule

Course Outline
Day 1 Classroom, Paperwork and Gear Setup
Day 2 AM Confined Water Training
Day 2 PM Dives 1 and 2
Day 3 AM Classroom and Dive Planning
Day 3 PM Dives 3 and 4
Day 4 AM Final Exam
Day 4 PM Dive 5
Pricing and Reservations

PADI Tec 50 Diver Course

• $800 per Person

Dive Equipment

Provided
• Tanks, weights, gas fills

Required
• Mask, fins, Back-plate, wing, regulators x 3, dive computers, dsmb, reel & finger spool, thermal protection, flashlight, dive planning software
• See course description sheet for more specific equipment requirements

Rental
• Students can rent all required equipment for training.
• Cost: $75 per course

Prerequisites

• At least 18 years of age
• Minimum Certification: Advanced Open Water, Enriched Air / Nitrox
• Minimum Dives: 40 total logged dives, 20 nitrox dives, 10 dives deeper than 100’
• Medical statement signed by physician in past 12 months

PADI Tec 65 Trimix Diver

Horizon Divers – Dive Courses
Course Description

Course description coming soon

Class and Dive Schedule

Course Outline Coming Soon
Pricing and Reservations

PADI Tec 65 Trimix Course

• Contact Us

Dive Equipment

Provided
• Tanks, weights, gas fills

Required
• Mask, fins, Back-plate, wing, regulators x 3, dive computers, dsmb, reel & finger spool, thermal protection, flashlight, dive planning software
• See course description sheet for more specific equipment requirements

Rental
• Students can rent all required equipment for training.
• Cost: $75 per course

Prerequisites

• Minimum age of 18 years old,
• Certified as a PADI Rescue Diver or equivalent,
• Have proof of CPR and first aid training within the previous two years,
• Certified as a PADI Tec 50 Diver or equivalent,
• Have a medical form signed by your physician and
• Have a minimum of 100 logged dives.

PADI-DSAT TEC Trimix Diver

Horizon Divers – Dive Courses
Course Description

Course description coming soon

Class and Dive Schedule

Course Outline Coming Soon
Pricing and Reservations

PADI-DSAT TEC Trimix Course

• Contact Us

Dive Equipment

Provided
• Tanks, weights, gas fills

Required
• Mask, fins, Back-plate, wing, regulators x 3, dive computers, dsmb, reel & finger spool, thermal protection, flashlight, dive planning software
• See course description sheet for more specific equipment requirements

Rental
• Students can rent all required equipment for training.
• Cost: $75 per course

Prerequisites

• Minimum age of 18 years old,
• DSAT Tec 65 certification or equivalent
• Rescue Diver (including proof of training in CPR and first aid within previous two years).
• A minimum of 150 logged dives.

PADI-DSAT Gas Blender Course

Horizon Divers – Dive Courses
Course Description

Course description coming soon

Class and Dive Schedule

Course Outline Coming Soon
Pricing and Reservations

PADI-DSAT Gas Blender Course

• Contact Us

Dive Equipment

Provided
• Tanks, weights, gas fills

Required
• Mask, fins, Back-plate, wing, regulators x 3, dive computers, dsmb, reel & finger spool, thermal protection, flashlight, dive planning software
• See course description sheet for more specific equipment requirements

Rental
• Students can rent all required equipment for training.
• Cost: $75 per course

Prerequisites

• Minimum age of 18 years old,
• DSAT Tec 65 certification or equivalent
• Rescue Diver (including proof of training in CPR and first aid within previous two years).
• A minimum of 150 logged dives.

Additional PADI Tec Courses

PADI Technical Diver Courses

(Gear is not included in the Tec Courses)
Course Info Below Coming Soon!

Specialty Estimated Cost
PADI Tec Trimix 65 $1,500
PADI Full Tec Trimix $1,800
Technical Wreck Diver $1,000
Gas Blender $199
Advanced Gas Blender $300
Tec 40 CCR (Prism2 only) Call
Tec 60 CCR (Prism2 only) Call
Tec 100 CCR (Prism2 only) Call

TDI/IANTD/ERD/Rebreater Tec Diving Courses

TDI or IANTDERDIRebreathers
TDI or IANTD Technical Diver Courses

(Gear is not included in the Tec Courses)

Specialty Estimated Cost
Intro to Technical Diving $299
Advanced Nitrox $500
Decompression Procedures $500
Advanced Nitrox/Decompression Procedures Combined $1,000
Extended Range/ Trimix $1,500
Advanced Trimix $1,800
Advanced Wreck $1,000
JJ Air Diluent Call
JJ Air Diluent Decompression Call
JJ AIR Diluent Decompression Upgrade Call
JJ Helitrox Call
JJ Mixed Gas Call
JJ Advanced Mixed Gas Call
Hollis Prism2 Air Diluent Call
Hollis Prism2 Air Diluent Decompression Call
Hollis Prism2 AIR Diluent Decompression Upgrade Call
Hollis Prism2 Helitrox Call
Hollis Prism2 Mixed Gas Call
Hollis Prism2 Advanced Mixed Gas Call
ERDI Courses

(Gear is not included in the Tec Courses)

Specialty Estimated Cost
ERD Tender $199
ERD1 $350
ERD2 $400
ERD Full Face Mask Ops $299
ERD Drysuit Ops $299
ERD UW Crime Scene Investigation Ops Call

Learn More About Classes, Click Below

Horizon Divers – Dive Courses
PADI Discover Rebreather

Want to try cutting-edge dive equipment and learn about rebreather technology? The Discover Rebreather program is your opportunity to try a recreational rebreather or a technical Closed Circuit Rebreather (CCR) in controlled conditions. The program is open to certified divers at least 18 years of age who have logged at least 15 dives.

During the program, you’ll learn:

1. the differences between rebreathers and open circuit scuba
2. about the two basic rebreather types
3. how rebreathers function

You’ll also get in the water for a rebreather dive. Your PADI Rebreather Instructor or Tec CCR Instructor will show you new hand signals specific to rebreather diving and you’ll learn what the rebreather is telling you through the handset, heads up display (HUD) and audible alarms. You’ll also discover the differences in buoyancy control while descending, ascending and hovering in a rebreather, adjust the mouthpiece and bail out to open circuit. You’ll do all of this in the clear, calm waters of a pool or confined water so you can discover the new challenges and benefits of rebreather diving.
The Discover Rebreather program is an ideal opportunity to learn about this emerging technology.

PADI Rebreather Courses

Think rebreathers are just for technical diving? Think again because the latest rebreathers are lightweight, easy-transportable units that use sophisticated electronics to simplify their use. Rebreathers allow longer no decompression limits, reduced gas consumption and unmatched wildlife encounters.

What is a rebreather?
The primary difference between rebreathers and open-circuit units is that rebreathers reuse some or all of the gas you exhale. There are two basic types of rebreathers: closed-circuit rebreathers (CCRs) and semi-closed rebreathers (SCRs).
The PADI Rebreather and Advanced Rebreather Diver courses use Type R units to introduce divers to rebreather diving within recreational dive limits. Type R rebreathers are electronically controlled and provide a back up for all the major systems and simplify training and use.

All rebreathers used during PADI courses must be third-party tested and manufacturers must ensure they meet a comprehensive list of requirements.

Because each rebreather model is different, you will need to qualify on each rebreather model. However, once you are qualified you will not need to repeat the entire course to earn your certification with a different Type R rebreather model. The PADI Rebreather Qualifier focuses on the knowledge and skills needed to use a different Type R rebreather model.

PADI Rebreather Diver
In this entry-level rebreather program you will learn to use Type R rebreathers to a maximum of 18 metres/60 feet within no decompression limits.

Prerequisites:
• PADI Open Water Diver and PADI Enriched Air Diver certifications (or qualifying certifications from a recognized organization).
• 25 logged dives
• 18 years old

PADI Advanced Rebreather Courses

This course expands on the basic knowledge you have already acquired and provides training to a maximum of 30 metres/98 feet (40 metres/130 feet if you have a PADI Deep Diver certification), including carrying a bailout cylinder.

Prerequisites:
• PADI Open Water Diver and PADI Rebreather Diver certifications (or qualifying certification from a recognized organization) on the Type R rebreather used in the course
• 30 logged dives
• 18 years old
• PADI Advanced Open Water Diver certification (prior to PADI Advanced Rebreather Diver certification)

PADI Tec 40 CCR Diver

Tec 40 CCR Diver Course

Learn to plan and make dives using air diluent and air or enriched air (EANx) bailout gas on Type T (technical) closed-circuit rebreathers (CCR) to a maximum of 40 metres/130 feet with a single decompression stop of no more than 10 minutes.
Tec 40 CCR Diver is the first level of training that addresses technical diving with Type T CCRs, which include a range of electronic CCRs (eCCRs) and manual CCRS (mCCRs). Tec 40 CCR Diver introduces student divers to diagnosing life-support problems and, when possible, returning to the loop to complete the dive with limited decompression obligations.
This training is significantly more challenging than recreational rebreather diving because divers learn to be both a tec diver as well as learning to tec dive with a CCR.

Prerequisites:
• PADI Advanced Open Water Diver, PADI Enriched Air Diver, PADI Deep Diver (or have experience of more than 10 dives to 30 metres/100 feet) certification and at least 30 dives logged with specific experience requirements.
• Prior to Training Dive Five, student divers must be certified as PADI Rescue Divers
• Prior to certification, student divers must have 50 dives logged.
• There are provisions for other qualifying certifications.
• 18 years old

What is a closed-circuit rebreather?
Closed-circuit rebreathers are a type of scuba that reuses the gas you exhale. This is the primary difference between CCR and open-circuit scuba.

All CCRs used on PADI TecRec CCR courses must be third party tested and manufacturers must ensure they meet a comprehensive list of requirements and register them with PADI.

Tec 40 CCR Qualifier program
Due to differences between CCRs, divers qualify on each CCRs, however, once qualified you will not need to repeat the entire course if you want to learn to dive a different Type T CCR. The Tec 40 CCR Qualifier focuses on the knowledge and skills divers need to cross over from one Type T CCR to another.

Background on Closed Circuit Rebreathers
Technical diving has been revolutionized by the development, availability and reliability of Closed Circuit Rebreathers. CCRs provide numerous benefits to the technical diver, including: reduced gas consumption, optimum EANx blends for decompression and a wider range of solutions to equipment problems. Consequently CCRs potentially allow the technical diver a greater access to time underwater – greater time based on gas logistics when compared with an open circuit technical diver and more time available to find solutions to gas management problems. As time is a critical and a finite resource divers wanting to dive at and beyond the recreational envelope can now choose PADI Technical CCR training to achieve their goals.

PADI Tec 60 CCR Diver

Tec 60 CCR Diver is an intermediate technical Closed Circuit Rebreather (CCR) diver program where you’ll learn to use life support equipment in completing dives outside the recreational and air diluent envelope.
You will learn to plan and make dives using trimix/heliox (minimum 16% oxygen) as a diluent using a Type T CCR to a maximum depth of 60 metres/200 feet and complete multiple decompression stops while carrying adequate bail out gas for the dive.

Tec 60 CCR Diver is the second level of training that addresses technical diving with Type T CCRs, which include a range of electronic CCRs (eCCRs) and manual CCRs (mCCRs). Tec 60 CCR develops the understanding and skills for diagnosing life-support problems while using trimix/heliox to complete a technical dive with its necessary decompression obligations.

Prerequisites:
• Tec 40 CCR Diver or other qualifying certification
• Proof of 150 logged dives, with at least 25 dives and 50 hours experience with the Type T CCR used in the course with an offboard bailout system following Tec 40 CCR Diver principles. At least 10 of these dives must be deeper than 30 metres/100 feet.
• 18 years old

Tec 60 CCR Qualifier program
Due to differences between CCRs, divers qualify on each CCR. However, once qualified, if you wish to cross over to another Type T CCR, you’ll only need to complete the Tec CCR Qualifier program, which covers unit-specific skills and knowledge.

PADI Tec 100 CCR Diver

Tec 100 CCR Diver is at the top of the PADI Tec CCR diver training. In this course, you’ll learn to plan and make hypoxic trimix/heliox dives using a Type T (technical) CCR to a maximum of depth of 100 metres/328 feet, carry and manage multiple bailout cylinders and complete multiple decompression stops.

The Tec 100 CCR Diver course addresses technical diving with Type T CCRs, which include a range of electronic CCRs (eCCRs) and manual CCRs (mCCRs). Tec 100 CCR Diver refines your ability to diagnose, understand and effectively respond to life-support problems. In the course, you will use hypoxic trimix/heliox diluent to complete a technical dive, with its necessary decompression obligations, while carrying a range of high/low oxygen and trimix/heliox bailout cylinders.

This training is significantly more challenging than the Tec 60 CCR Diver course in part because it includes the use of diluents and bailout gases you cannot safely breathe at the surface. Successful Tec 100 CCR Diver course completion requires divers to demonstrate the superior level of skill necessary to competently dive a technical CCR at exploration depths.

Prerequisites:
• Tec 60 CCR Diver course certification (or qualifying certification from another organization).
• Proof of 175 logged dives, with at least 50 dives and 100 hours experience diving the Type T CCR used in the course with off board bailout systems. At least 25 of these dives must be multistop decompression dives deeper than 40 metres/130 feet with trimix/heliox diluent.
• 18 years of age.

Tec 100 CCR Qualifier Program:
Divers wishing to apply their certification to another Type T CCR at the Tec 100 CCR Diver level will need to complete the Tec CCR Qualifier program, which covers skills and knowledge specific to the particular unit.

Tec 100 CCR Refresher:
This refresher program covers the level of skills required to make Tec 100 CCR dives. Divers may also refresh skills appropriate for the Tec 40 and 60 CCR Diver courses as well, if required.

TDI Rebreather Diver Certification

The TDI Air Diluent Closed Circuit Diver Course will be unit specific for the PRISM2 and is your first step into closed circuit rebreather diving (CCR Diving) and your first truly quiet diving experience. Using the latest in technology CCR’s maximize your gas supply of Air and provide the optimum breathing gas for any depth by maintaining a constant partial pressure of oxygen (PPO2). During the dives (minimum of seven) your TDI Instructor will teach you all the necessary skills to conduct CCR dives to a maximum depth of 30 m/100 feet.

The skills for this CCR Diving Course include:
• Setup and maintenance of the unit
• Loop volume management
• Calibration of electronics
• Emergency procedures
• Buoyancy control
• CNS tracking

AIR DILUENT CLOSED CIRCUIT REBREATHER DECOMPRESSION PROCEDURES DIVER COURSE

The TDI Air Diluent Closed Circuit Decompression Procedures Diver Course will be unit specific for the PRISM2 and is the second level certification course for divers wishing to utilize a closed circuit rebreather (CCR) for air diving. The objective of the course is to train divers in the benefits, hazards and proper procedures for diving a CCR and to develop basic CCR diving skills to a maximum depth of 45 metres / 150 feet using an air diluent for formal decompression diving. 

The skills for this CCR Diving Course include:
• Setup and maintenance of the unit
• Loop volume management
• Calibration of electronics
• Emergency procedures
• Buoyancy control
• CNS tracking

MIXED GAS CLOSED CIRCUIT REBREATHER DIVER COURSE

The TDI Mixed Gas course will be unit specific for the PRISM2 and is your next step into closed circuit rebreather diving and with the addition of helium as a diluent gas, it is your opportunity to explore a little deeper. Using the lastest in technology CCR’s maximize your gas supply and provide the optimum breathing gas for any depth by maintaining a constant partial pressure of oxygen(PPO2). During the dives (minimum of 6) your TDI Instructor will teach you all the necessary skills to conduct CCR dives utilizing helium as a diluent gas and oxygen levels as low as 16 percent to a maximum depth of 60 m/200 feet. 

The skills for this CCR Diving Course include:
• Calculating off-board gas requirements
• Recovering from system failure
• Calibration of electronics
• Emergency procedures
• Removing and replacing off-board gases
• Surface marker buoy deployment

ADVANCED MIX GAS CLOSED CIRCUIT REBREATHER DIVER COURSE

The highest level of CCR training that TDI offers, the Advanced Mixed Gas course will teach you to use the full capabilities of your PRISM2. With a maximum depth of 100 m/330 feet this course opens up new wrecks, caves and walls to explore. This intensive course conducted over seven days will focus on all the elements needed to plan and execute dives to these depths.

Topics and skills for this course include:
• Off board gas calculations and management
• Gas shutdowns and loss of gas drills
• Equivalent narcotic depth calculation
• Recovering from system failure
• Labeling and placing of off board gases