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Tec Zone · 40-100m · SSI XR Programme

SSI XR Hypoxic
Trimix 100

One hundred metres. The highest certification in SSI's recreational technical programme. Extended decompression, leaner hypoxic mixes, and the full discipline of extreme-depth tec diving.

Apply for This Course Course Requirements
Certified by SSI
Course Price
€1,050
€800 course fee + €250 SSI eLearning · all hypoxic trimix and deco gases included
✓SSI XR Trimix 100 eLearning
✓6 guided tec dives
✓All gas fills (trimix 10/70, EAN50, O2)
✓Equipment hire available
✓SSI XR Hypoxic Trimix 100 certification card
Apply for This Course

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6
Open Water Dives
4
Course Days
100m
Cert. Depth
TEC
Zone
TX80
Prerequisite
0
Confined Water
Course Overview

From 80m to 100m. The highest recreational tec certification.

SSI XR Hypoxic Trimix 100 builds directly on Trimix 80 certification, extending the operating depth to 100m. Divers use leaner hypoxic bottom gas mixes with higher helium fractions, manage significantly longer decompression obligations, and operate with zero margin for error in gas planning and procedure. The course covers advanced gradient factor decompression, HPNS risk management at extreme depth, multi-gas switch discipline with two stage cylinders, and contingency procedures for equipment failure at 100m.


On completion you hold the SSI XR Hypoxic Trimix 100 certification - the highest depth rating available in SSI's recreational technical programme. In Malta, 100m access opens the outer faces of major drop-offs and the deepest sections of offshore structure well beyond recreational limits.

  • Plan and execute multi-gas dives to 100m with extended decompression
  • Select and validate hypoxic trimix blends for 100m operation with reduced O2 fractions
  • Manage 45-60 minutes of planned decompression across multiple gas switches
  • Recognise and mitigate HPNS risk through descent rate management and mix selection
  • Operate with two stage cylinders in full tec configuration
  • Execute contingency procedures for lost deco gas at extreme depth
SSI

SSI XR Hypoxic Trimix 100

The highest depth certification in SSI's recreational tec programme. Recognised worldwide for tec access to 100m.

Depth Limit
100m Tec Zone
Prerequisite
SSI XR Hypoxic Trimix 80 (mandatory - no equivalent accepted)
Min. Age
18 years
Card Issued
SSI XR Hypoxic Trimix 100 card issued on completion of 100m certification dive
Training Pathway
Deep Diver - Extended Range Trimix (45m) - Technical Extended Range Trimix (60m) - Trimix 80 - Trimix 100

Your certification range after this course

OWD 18m
AOWD 30m
Deep Diver 40m
Trimix 80 80m
Trimix 100 100m

100m is the maximum depth in the SSI XR recreational technical programme.

Course Content

Six dives. Progressive depth to 100m.

The first two dives confirm proficiency at Trimix 80 level before extending to 90m and 100m. Each dive adds depth and decompression obligation.

Dive
01

Trimix 80 Review

60m

Confirm gas switch procedure, equipment configuration, and decompression execution at a depth within existing certification. Assessment dive before extending beyond 80m.

  • Equipment check and valve drill at surface
  • Multi-gas profile: TX 12/65 to EAN50 at 21m to O2 at 6m
  • Decompression stops executed from dive computer
  • Instructor assessment of readiness to proceed to 90m
Dive
02

80m Warm-Up

80m

Full Trimix 80 profile as baseline before the 100m extension. Gas management, decompression execution, and HPNS symptom review. Briefing includes transition to Trimix 10/70 for subsequent dives.

  • Gas turn pressure discipline with TX 12/65
  • Narcosis and HPNS self-assessment at 80m
  • Decompression obligation approximately 25-35 minutes
  • Introduction to Trimix 10/70 handling for next dive
Dive
03

90m Extension

90m

First dive with Trimix 10/70 bottom gas. Lean hypoxic mix with high helium fraction. Pre-breathe from EAN50 before switching to trimix below 6m on descent. Decompression obligation approximately 35-45 minutes.

  • Pre-breathe protocol and EAN50 to TX10/70 switch on descent
  • Managing longer decompression ceiling at 90m
  • CNS oxygen accumulation tracking across all gas phases
  • Gas turn pressure with leaner mix - tighter margins
Dive
04

90m Consolidation

90m

Second 90m profile. Refine decompression execution, HPNS observation, and ascent rate discipline. Any adjustment to gradient factor settings based on day 3 experience. Sign-off required before 100m certification dive.

  • Decompression profile refinement based on day 3 data
  • HPNS tremor and visual disturbance self-monitoring
  • Ascent rate: maximum 3m per minute above first deco stop
  • Post-dive CNS oxygen recovery period confirmed before next dive
Dive
05

100m Approach

95m

Penultimate dive. Full multi-gas profile to 95m with extended decompression. Final assessment before the certification dive. Any issues at this stage postpone the 100m dive.

  • Full planned decompression - approximately 50-60 minutes in water
  • O2 stop management at 6m and 3m
  • Team diving at extreme depth - team separation protocol
  • Certification dive readiness confirmed by instructor
Dive
06

100m Certification Dive

100m

The qualifying dive. Gas plan prepared and signed off the evening before. Full TX10/70 profile to 100m, complete decompression schedule executed. SSI XR Hypoxic Trimix 100 certification issued on successful completion.

  • Independent gas plan prepared and signed off by student
  • Controlled descent to 100m: maximum 18m per minute
  • Decompression profile followed precisely - no deviation
  • Certification sign-off on successful surface
Gases Used

Advanced three-gas configuration.

Trimix 100 uses a leaner hypoxic bottom gas than Trimix 80, with a higher helium fraction to reduce narcosis and HPNS risk at extreme depth.

Trimix 10/70
10% O2 / 70% He / 20% N2
MOD 100m

Very lean hypoxic mix with high helium fraction. Mandatory pre-breathe from EAN50 below 6m on descent. Descent rate limited to 18m per minute to reduce HPNS risk.

EAN50
50% O2 / 50% N2
MOD 21m

Travel and transition gas - surface to 21m on descent and from 21m on ascent. Mandatory switch from trimix at 21m. Used throughout the extended decompression ascent.

O2 100%
100% Oxygen
MOD 6m

Extended decompression at 6m and 3m. At 100m bottom times, CNS accumulation across multiple dives is critical. Total dive CNS must not exceed 80% per day.

At 100m, total in-water time including decompression is typically 90-120 minutes per dive. Gas costs are additional and itemised at booking. Two stage cylinders required - one EAN50, one O2.
Equipment Required

Full advanced tec configuration.

Trimix 100 requires a more complete configuration than Trimix 80. Two stage cylinders are mandatory. A drysuit is strongly recommended.

Back-mount doubles minimum 2x15L recommended
Technical wing and harness rated to 100m+
Two primary DIN regulators - serviced within 12 months
Long-hose primary (200cm)
EAN50 stage cylinder with labelled regulator
O2 deco cylinder with labelled regulator
Multi-gas dive computer validated to 100m
Backup dive computer
Primary torch and backup torch
Primary reel plus spool
Two SMBs including one delayed
Drysuit (strongly recommended - 14-16 degrees at 100m in Malta)
Mandatory equipment check before the first dive of the course. All cylinders inspected and analysed. All equipment must be in current service.
What's Included

Everything you need

SSI XR eLearning

Lifetime access to SSI XR Hypoxic Trimix 100 digital theory. Study at home before the water sessions.

All Cylinder Fills

All trimix 10/70, EAN50, and O2 fills for the complete 6-dive programme. Gases blended and analysed on site.

Tec Boat Dives

All 6 dives from diveshack's tec dive vessel at Malta's deep offshore sites, selected for optimal conditions at each stage.

XR 100m Certification

SSI XR Hypoxic Trimix 100 card issued on successful completion of the 100m certification dive.

Not included: Drysuit hire if not owned (available on request). Multi-gas tec computer hire if needed. DAN dive accident insurance - strongly recommended at these depths.
Requirements

Mandatory prerequisite: SSI XR Hypoxic Trimix 80.

There are no equivalents or exceptions to the Trimix 80 prerequisite. This is an SSI programme requirement. If you do not yet hold Trimix 80, contact us about the full training pathway or the combined 80 and 100 programme.

  • Required SSI XR Hypoxic Trimix 80 certification - no exceptions
  • Required Minimum 20 logged trimix dives
  • Required Minimum 10 dives at 60m or deeper
  • Required Two-stage-cylinder configuration experience
  • Required Multi-gas dive computer validated to 100m+
  • Required Valid CPR and First Aid (within 2 years)
  • Strongly Recommended Drysuit certification - water at 100m in Malta is 14-16 degrees
Training Pathway

Starting from recreational diving?

The full pathway from Open Water to Trimix 100 is: OWD (18m) then AOWD (30m) then Deep Diver (40m) then Extended Range Trimix (45m) then Technical Extended Range Trimix (60m) then Trimix 80 (80m) then Trimix 100 (100m). Contact us - we can structure the complete pathway as a continuous training programme.

Enquire about full pathway →
Combo Option

Trimix 80 and 100 together

We offer both certifications as a single 6-day combined programme - 11 dives, two SSI XR certification cards. Completing both courses together offers savings vs booking separately.

View combo programme →
Pricing

Course options

Tec Specialty
XR Hypoxic Trimix 100
€1,050

Price on application. Trimix 80 certification required before booking.

  • ✓ SSI XR eLearning for Trimix 100
  • ✓ 6 guided tec dives
  • ✓ All gas fills - TX 10/70, EAN50, O2
  • ✓ SSI XR Hypoxic Trimix 100 cert card
  • ✓ Equipment hire on request
  • ✓ Max 3 students per instructor
Apply Now
Combo - Trimix 80 and 100
Enquire

Complete both certifications in a single 6-day programme. Enquire for combined pricing.

  • ✓ Everything in Trimix 80 and 100
  • ✓ 11 total tec dives
  • ✓ 2 SSI XR certification cards
  • ✓ Continuous instructor through both courses
Enquire

Gas costs additional · Deposit required · Trimix 80 cert must be verified at time of booking

FAQ

Common questions

Do I need Trimix 80 before this course? ▼
Yes. SSI XR Hypoxic Trimix 80 is a mandatory prerequisite and there are no recognised equivalents at this level. If you hold Trimix 80 from a different agency (PADI TecRec, IANTD, TDI) contact us and we will advise on crossover requirements.
How long is the decompression at 100m? ▼
A 10-minute bottom time at 100m on a standard gradient factor generates 45-60 minutes of decompression obligation. Total in-water time including ascent is 90-120 minutes per dive. We plan conservatively and adjust based on conditions and CNS accumulation.
Is a drysuit mandatory? ▼
Not mandatory but strongly recommended. Bottom temperature at 100m in Malta is consistently 14-16 degrees regardless of season. Extended decompression stops at these temperatures in a wetsuit are uncomfortable and carry hypothermia risk. Drysuit hire is available from diveshack - contact us early to confirm sizing.
Can I do Trimix 80 and 100 back to back? ▼
Yes. We offer both certifications as a combined 6-day programme. Several dives serve dual purposes in the combined course, reducing total cost vs booking separately. Enquire for the combo programme.
What happens if conditions are not suitable for 100m on certification dive day? ▼
We will not run the 100m certification dive in marginal conditions. If conditions require a postponement, we reschedule at no additional cost. Gas already blended is charged at cost.
Related Courses

Continue your training

80m · XR Programme

SSI XR Hypoxic Trimix 80

The mandatory prerequisite. 80m certification, hypoxic trimix gas planning, and decompression management.

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80 + 100m

Trimix 80 and 100 Combo

Complete both certifications in one 6-day programme. Two SSI XR cards. Enquire for combo pricing.

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