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During the incident the main depth gauge on the submarine failed as it was diving, a defence source confirmed, but a secondary depth gauge was still working.

With a smaller saw - with a depth gauge set to make sure the nothing else was damaged - they sliced open an armoured glass display case, seized the tiara and a matching brooch, and fled.

Measuring sticks that dot the river at key points and provide depth gauges related to a set historical "zero" level - instead of the river bed - have dropped into negative territory.

Wrap a piece of tape around the bit first as a depth gauge so you don’t accidentally drill so deep that you make a hole through the front.

He uses a digital depth gauge, fish finder, and underwater camera.