Penelope's tag has a time depth recorder, which documents the dive depth, dive duration, and light levels.

The dive depth cannot be increased easily.

This is affordable for civilian research submersibles, but not military submarines, so their dive depth was always bounded by current technology.

Melon size is unrelated to maximum dive depth in toothed whales.

A residual nitrogen time is found from the repetitive group and the repetitive dive depth which is to be added to the planned bottom time.

When the dive depth and time are extended, the use of breathing gases other than air can reduce the risks.

They implanted small data loggers in 10 birds to record dive depth at two-second intervals.

They were rated for a dive depth of 80 metres, though in service depths of 120 metres were recorded.

I'm within dive depth.

The researchers implanted sensors in female ducks that recorded heart rate, pressure (for dive depth) and body angle.