So ... we had this great dive and found a couple of crayfish. With one of which we accidentally moved it's cover... a battle for a new hideout started. The concrete slabs laying here were having lots of holes underneith... but all were taken.
(I noticed the video still needed to be rendered .. I'll check tonight if it is working properly)
After a while we left these crayfish alone to sort thing out... We'll check on our next dive if there are any carcasses lying around.