What do I do if my primary light fails underwater?

Switch to your backup light, signal your buddy, and begin a normal ascent and exit. A night dive should always be planned around the assumption that any single light can fail, which is why a backup is non-negotiable, not optional.

Checklist

Night Dive Checklist

Diving after dark turns a familiar site into a new one, but it also strips away your margin for error, so lights, signals, and surface support carry the day.

Dive with a buddy, agree on every signal topside, and never go in without a backup light.

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Lights

Dive Lights

Navigation & signals

Exposure & surface support

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Common questions

What do I do if my primary light fails underwater?: Switch to your backup light, signal your buddy, and begin a normal ascent and exit. A night dive should always be planned around the assumption that any single light can fail, which is why a backup is non-negotiable, not optional.