Diving beetle

Diving beetle

Observation - Diving beetle - UK and Ireland. Description: Sorry, not much to go on here but is anyone able to identify this species of diving beetle from the poor photos and the approx. size? There were several of them in a concrete stock drinking trough, in the middle of a heathland nature reserve.

Sorry, not much to go on here but is anyone able to identify this species of diving beetle from the poor photos and the approx. size?

There were several of them in a concrete stock drinking trough, in the middle of a heathland nature reserve.