Large beetle active under ice in drainage ditch
No interactions present.
You might well be correct but there are 4 very similar Dytiscus beetles and without a shot of the underside I think it may be difficult to get to species level. It might be wise to add an ID of just Dytiscus.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Lat/Lng: 51.0335, -2.9747
OS grid ref: ST317264