by deniability I mean that you cannot be sure if this is Russia, USA or someone else. If you use depth charges, they explode in certain way and leave some debri

by deniability I mean that you cannot be sure if this is Russia, USA or someone else. If you use depth charges, they explode in certain way and leave some debris which say "this was XXX bomb so must be Russia/USA". This is sabotage for sure.