We cloud use voult on ship.
It would work like big treasure chest where you can store one "crate/keg/tresure/" item.
It cloud be like hath on the deck or side of the ship. Or repurposed barrel.
If keg inside voult will detonate it will not caus fire or make eny holes but will rock ship as normall explosion.
You can picklock enemy chest by iteracting by X time.
I think that it will add a reason to catry and use kegs nicly balansing risk of having them with potentional gains in combat.
