Prism 2 CCR Checklist
A systematic pre-dive workflow for the Hollis Prism 2 eCCR
Warning: This checklist is a reference aid, not a substitute for proper CCR training. Never dive a rebreather without manufacturer-approved training and certification. Failure to properly assemble and check your unit can result in serious injury or death. Always follow the procedures taught by your instructor and outlined in the Hollis Prism 2 owner's manual.
Hollis Prism 2 eCCR Pre-Dive Checklist
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Date:
Diver: ________________________
Site: ________________________
Overall Progress
0 / 0
Analyze everything. Trust nothing.
Your cells are your lifeline.
If the computers disagree, the dive is over.
Pause. Review your work.
Everything from here forward depends on what you just built. Before moving to leak checks, take 30 seconds. Look at your loop. Trace every hose. Check every connection with your hands, not your memory. If something feels off, now is the time to find it. Not at 100 feet.
The next 5 minutes could save your life.
The pre-breathe is not a formality. It is your last chance to catch a bad scrubber pack, a failing cell, or a CO2 leak before you submerge. Breathe normally. Do not rush. Do not multitask. If you feel even a hint of headache, increased breathing rate, or air hunger, STOP. Do not dive. Remove from loop, breathe fresh air, and diagnose.
If you are rushing, you are not ready.
The dive is not over until the gear is clean.
Scrubber Duration Log
Track cumulative scrubber usage. Consult your manual for rated limits based on water temperature and workload.
Why This Checklist Exists
Rebreathers don't forgive complacency. An open-circuit diver who skips a check might have a bad dive. A CCR diver who skips a check might not surface. The Hollis Prism 2 is a capable unit, but every CCR demands the same discipline: a methodical, unhurried pre-dive ritual performed every single time.
This checklist follows the general flow taught in most CCR courses: unit assembly, gas verification, electronics and sensor calibration, leak checks, pre-breathe, and final buddy checks. It is not a replacement for your training or your instructor's specific procedures. Adapt it to your workflow, but never skip steps.
The three most dangerous words in rebreather diving: "I already checked."