NDL and turn pressure at 24 m on EAN32

A wreck at 24 m, planned on EAN32 (32% oxygen) in a current, on a single steel 12. Richer nitrox buys more no-decompression time than air at the same depth — here is what it buys on this dive.

The figures

• NDL limit: 35 minutes (Bühlmann ZH-L16C, gradient factors 40/85).
• Minimum gas: 50 bar (at an SCR of 18 L/min in a current — the reserve now scales with your own breathing rate, not a fixed one).
• Turn pressure (thirds): 172 bar, reached at minute 10.4 of the dive.
• Time at maximum depth as planned: 11.45 minutes, for a total dive time of 28.81 minutes including the ascent levels and safety stop.

Inputs used

• Depth: 24 m
• Gas: EAN32
• Cylinder: single steel 12 L (232 bar), started at 232 bar
• SAC rate: 18 L/min
• Gas strategy: thirds
• Conditions: current (raises consumption above the calm-water rate)
• Limit style: NDL with safety stop
• Gradient factors: 40/85 (set for this example)

MOD for EAN32 at the app's ppO₂ 1.4 hard block is 33 m, well past this dive's 24 m — the mix is not the limiting factor here, the NDL is.

Source: Turn Pressure's pinned etalon suite, case 4 — "Wreck at 24 m on EAN32" (EtalonProfilesTests.swift), re-derived on 2026-09-26 when the minimum gas became two divers at the diver's own SCR.

Your training, your gauge and your computer decide the dive. This is pre-dive arithmetic, not a dive computer, and it does not make any dive safe.