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Twinset & Decompression Programmes
Twinset & DECO Training
Diving a Twinset opens the door for some more serious diving, increased depth and duration are now at your fingertips. For those diving in a backplate and wing the transition is fairly straight forwards, for those who have previously dived a regular jacket style BCD the difference perhaps a little bigger. We've highlighted the different options below, if you are not sure just contact us and tell us what you wish to achieve.
The team at DC Diving are delighted to offer both RAID & TDI Technical Twinset Courses
The Technical Diving International (TDI) is a globally renowned scuba diving training agency that specialises in providing comprehensive instruction and certification for individuals seeking to explore the thrilling and challenging world of technical diving. Founded with a commitment to advancing the boundaries of recreational scuba diving, TDI offers a wide range of courses designed to equip divers with the knowledge and skills required for diving beyond the traditional limits. Whether it's deep diving, wreck exploration, cave diving, or utilizing mixed gases, TDI is a leading authority in training divers to safely and confidently explore the underwater realm in more demanding and exhilarating conditions. With a strong emphasis on safety, TDI has earned a reputation for producing highly skilled technical divers who are prepared to tackle the underwater world's most fascinating and challenging environments.
Founded in 2007 as a specialised rebreather organisation, RAID has evolved into a global agency that maintains a distinct "technical first" philosophy across its entire curriculum. Unlike traditional agencies that treat technical diving as a separate add-on, RAID integrates advanced principles—such as horizontal trim, technical equipment configurations, and precise buoyancy—into its foundation, requiring even entry-level students to train with an explorer's mindset. This rigor is supported by a comprehensive technical track covering everything from open-circuit decompression and trimix to sophisticated rebreather and cave training. Leveraging a 100% digital platform, the agency ensures quality through a strict audit trail and a mastery-based approach, emphasising that a diver is only as good as their actual skill set rather than their number of logged dives.
TDI Courses
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The TDI Intro to Tech Course is the ultimate starting point for divers looking to expand their skills and step into the world of technical diving.
This foundational course introduces advanced techniques, equipment configurations, and mindset shifts needed for more demanding dive environments.
You’ll refine your buoyancy, trim, and propulsion techniques, and learn how to manage redundant systems and handle potential emergencies with confidence. Whether you aspire to explore deeper depths, overhead environments, or simply want to dive with a more streamlined and efficient setup, Intro to Tech sets the stage. It's not just about learning new skills—it's about transforming your diving approach and preparing you for the exciting challenges ahead.
Take the first step toward your technical diving journey and unlock new underwater possibilities!Price From £650
Duration From 3-4 Days
Pre-Requisite Confident Twinset Diver
Equipment Supplied Twinset/Wing/Regulators
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The TDI Advanced Nitrox Course is your gateway to diving beyond the limits of recreational no-stop diving, unlocking the potential of enriched air mixtures for safer and more efficient dives. Designed for those ready to elevate their skills, this course teaches the use of nitrox mixes ranging from 22% to 100% oxygen, preparing you for extended bottom times, precise gas planning, and more advanced diving environments.
The TDI Decompression Procedures Course is the key to unlocking longer, deeper dives by teaching you how to safely plan and execute staged decompression dives. This course goes beyond recreational limits, focusing on advanced dive planning, precise gas management, and decompression strategies. You’ll gain the skills to conduct dives to a maximum depth of 150 feet (45 meters) while mastering ascent techniques and contingency planning for real-world scenarios.
Combining these two wonderful courses gives you the ability to perform accelerated decompression dives to 45m using 50% or 100% deco mixes.Price From £950
Duration From 3-4 Days
Pre-Requisite Intro to Tech & Twinset Diver
Equipment Supplied None
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The TDI Helitrox Diver Course is your introduction to the benefits of helium-enriched gas mixtures for safer and clearer thinking during dives beyond recreational limits. Designed for divers seeking to extend their range while minimizing narcosis, this course teaches the use of helitrox blends (helium and nitrox) for staged decompression dives to a maximum depth of 150 feet (45 meters).
This program is desiged to be taken after Advanced Nitrox, and combines both Decompression Procedures with the use of Helium. You’ll master advanced gas planning, multi-cylinder handling, and decompression strategies, while learning how helium improves dive performance at depth. Whether you're exploring deeper recreational limits or preparing for full trimix diving, the Helitrox Diver Course equips you with the tools to dive deeper with confidence, safety, and precision.
Combining these two wonderful courses gives you the ability to perform accelerated decompression dives to 45m using 50% or 100% deco mixes and Helium enriched back gas mixes.Price From £950
Duration From 3-4 Days
Pre-Requisite TDI ANDP / Equivalent
Equipment Supplied None
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The TDI Trimix 60 Course is designed for divers ready to explore deeper depths with the safety and precision of trimix gas blends. This course teaches the use of trimix, a combination of oxygen, nitrogen, and helium, to mitigate narcosis and reduce gas density at depths up to 60 meters (200 feet). You’ll gain essential skills in advanced dive planning, gas management, and decompression strategies to safely navigate the challenges of deep diving. With a focus on handling multiple cylinders, managing gas switches, and executing precise ascent procedures, the Trimix 60 Course prepares you for the complexities of deep technical diving. If you're ready to extend your diving limits while maintaining the highest standards of safety, this course will give you the confidence to explore the deep blue.
Price From £750
Duration From 3-5 Days
Pre-Requisite TDI ANDP / Equivalent or Helitrox
Equipment Supplied None
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Price Upon Request
Duration Upon Request
Pre-Requisite TDI Trimix (60m) or Equivalent
Equipment Supplied None
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Price Upon Request
Duration Upon Request
Pre-Requisite TDI Trimix (75m) or Equivalent
Equipment Supplied None
RAID Courses
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The Twinset Foundations course is a fresh addition to the RAID program, designed to provide essential training for divers across all experience levels. Whether you’re a seasoned diver wanting to enhance your gas management practices or a newcomer eager to explore this popular kit configuration, this course offers expert guidance on safe and responsible twinset diving.
Price From £450
Duration From 3-4 Days
Equipment Supplied Twinset/Wing/Regulators
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Nitrox Plus is a two-cylinder course. Divers learn how to carry a bailout cylinder in addition to a regular backmounted primary cylinder*. It is your perfect opportunity to advance basic equipment management skills within a structured, modular learning environment.
*Course may be taken in sidemount or twinset configuration to meet redundant gas requirements.
Price From £550
Duration From 2-3 Days
Equipment Supplied None
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This RAID program is a three-cylinder course in which sidemount or twinset divers learn how to carry one cylinder of decompression gas (up to and including 100 percent oxygen).
Available to 40 metres max depth using air and nitrox or 45 metres air, nitrox & trimix.
Price From £650 (Not incl Trimix/Gas)
Duration From 3-4 Days
Equipment Supplied None
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The RAID Advanced Decompression Diver course is open to twinset or sidemount divers wanting to plan and execute dives using two different decompression gases to optimize off-gassing during ascent. Certifications for RAID’s Advanced Decompression course are offered in two options: 50 metres air and nitrox; 50 metres air, nitrox & trimix.
Price From £950 (Not Inc Gas)
Duration From 3-5 Days
Pre-Requisite RAID Decompression Diver
Equipment Supplied None
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RAID’s Normoxic Trimix course explores the theory, methods, and procedures for using helium breathing mixtures on dives as deep as 60 metres to reduce the effects of inert gas narcosis. This is essential training for conducting expedition-type dives in a variety of challenging conditions in fresh and salt water. Bottom mix must contain 18 percent oxygen, with decompression stress managed with up to three decompression gases containing up to 100 percent oxygen.
Price From £750 (Not Inc Gas)
Duration 3-5 Days
Pre-Requisite RAID Adv Deco Diver or Equivalent
Equipment Supplied None
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Price Upon Request
Duration Upon Request
Pre-Requisite RAID Normoxic Deco Diver (Or Equivalent)
Equipment Supplied None
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Price Upon Request
Duration Upon Request
Pre-Requisite RAID Normoxic Deco Diver (Or Equivalent)
Equipment Supplied None