Indeed. Energy sometimes escapes its confines. This usually results in fire.
The failure modes of EV batteries are probably quite different to those on ships (ships don't collide with other things nearly as often as cars collide with other things, for one). I'm sure ships have their own issues (e.g. falling into disrepair due to lax regulation requirements at the lowest-priced-ports-of-convenience), but you can't really compare an EV ship with an EV car.
The failure modes of EV batteries are probably quite different to those on ships (ships don't collide with other things nearly as often as cars collide with other things, for one). I'm sure ships have their own issues (e.g. falling into disrepair due to lax regulation requirements at the lowest-priced-ports-of-convenience), but you can't really compare an EV ship with an EV car.