The design compromised on diving depth to keep weight down and speed up.

However, this degradation in echo reflection was not uniform at all diving depths due to the voids being compressed by the water pressure.

The design came from G de Rooy and had a diving depth of 80 meters.

It had a diving depth of 25 metres.

They have a diving depth of 300 m. Normal endurance of these ships is 30 days with an extended range up to 70 days.

So the wreck lay about sixty feet down, easy diving depth.

The limit of the diving depth is governed by the strength of the pressure hull.

The letter L indicates the diving depth, in metres, guaranteed by the manufacturer.

The boats were a single hull design with a 50 metre maximum diving depth and a 30-45 second diving time.

The boat's design was a single hull/ saddle tank type with a diving depth of 25 fathoms (45 m).