Swanage diving school Swanage Dorset

Training and Courses






N.B. The course price does not include boat/entry fees or gas.

This course is designed to train those divers who wish to dive to depths between 39m and 60m, but who do not wish to breathe air below 39m. Trimix affords a means of reducing narcosis on dives to such depths.
The knowledge and skills taught in this program are more than adequate to qualify divers to perform Trimix dives outside of training up to 60m.


Must be qualified as an IANTD Advanced EANx Diver, or equivalent. (Divers already qualified as Technical Diver, see note below under Program content.)
Must provide proof of a minimum of 100 logged dives, of which at least 30 were deeper than 27m, or sufficient experience doing technical dives to satisfy the us that the student has the ability and knowledge to continue at this level of training.
Must be a minimum of 18 years of age.




All academic portions of the IANTD Technical Diver Student Workbook and appropriate specific reference text materials from the IANTD Technical Encyclopedia (not included in course materials package), and all course specific Slides pertaining to the theory of the course.

The program includes a minimum of 2 air dives or EANx or normoxic trimix with an O2 content greater than 18%. Depths of these 2 dives not to exceed 39m. Although it is only a requirement to use a single stage cylinder, it is highly recommended that 2 stage cylinders are carried. This provides far better redundancy for the type of diving being undertaken.

The program also includes minimum of 3dives on Trimix using at least 1 gas switch. These dives must be performed at a depth between 39m and 60m. Dive computers with gas switching capabilities are recommended but back up tables are also required. Dives may be made on custom software generated tables provided it is a program approved by IANTD.

The course includes a minimum of 220 minutes of run time and a minimum of 4 dives using Air, EANx or trimix.

Students can qualify with an overall average score of 6 points if 2 extra dives are completed.

N.B. Divers already qualified as Technical or Cave divers or IANTD Wreck Divers, can have the 2 air or EANx dives credited and only require the 2 Trimix dives between 39m & 60m. Plus complete the lecture on Normoxic Trimix in the workbook.


Twin set with isolation manifold in O2 service.
Primary regulator (preferably with 1.5-2m long hose, secondary regulator.
Wing, back plate and Harness. (BCD's not recommended)
2 x 5-7L Stage cylinders with regulators. All in O2 service. (Aluminum stages are much easier to use and are preferred over steel.)
Dry suit with suit inflation system. This can be a whip from a stage cylinder.
Reliable Primary torch and 1back up minimum.
2 timing devices minimum or computers.
Knife or Cutting tool.
Orange DSMB and reel or spool & 50m line. (yellow bags only for emergency signaling)

All equipment is available for hire at competitive rates if required.

Skills taught and practiced:

Gas shut downs
Gas sharing & Gas sharing ascents
Out of Gas procedures
Stage cylinder removal and replacement, stationary & swimming
DSMB deployment
Deco gas switching
Swim techniques

RMV calculations (Surface air consumption)
Line laying and wreck orientation
To visit the DSAT web site and information on all DSAT Technical diving courses including Gas Blending courses, please click on the Tec Rec logo.

The Pier, High Street, Swanage, Dorset. BH19 2AR.
Tel: 07968 780198