It was a limpet mine - they are magnetic mines that are attached to the hull and remotely detonated.
>>682557
The flying object and the limpet mines are not mutually exclusive. Anon thinks it possible there was limpet mines AND a drone.
The two are not mutually exclusive. May have been limpet mine(s) and a drone to document everything, for example.
now that's a giant prick.