If they were Stealth Otters, they failed their training.
They left 2 large turds on the floor.
Nope, they excelled. See below transcript.
Commander Otter: "Well lads, debrief me."
Sgt Otterson: "Insertion - perfect approach, and successful boarding."
Cpl Otterable: "We suspected their guard cat had spotted us, but there were no obvious signs of detection."
Sgt Otterson: "We each laid our mines, and bugged out in good time."
Commander Otter: "Excellent. Excellent. But what about shitting on their mat?"
Sgt Otterson: "Er... That's what I meant by 'mines', Sir"
Commander Otterson: "Aha, erm, of course Sergeant. Very good job. Well done chaps... Good ones, were they?"
Sgt Otterson: "Yessir, proper steamers."