The DMG, on web page 119 has stats for various automobiles. They normally have a number of tons of of hitpoints. Nevertheless, isn’t a ship a large object? If it have been, it might be topic to the principles regarding objects: on pages 246-247. The principles for objects state that:

That mentioned, one torch can burn a Big tapestry, and an earthquake spell can scale back a colossus to rubble. You may monitor a Big or Gargantuan object’s hit factors if you happen to like, or you’ll be able to merely determine how lengthy the article can stand up to no matter weapon or drive is performing towards it. In the event you monitor hit factors for the article, divide it into Massive or smaller sections, and monitor every part’s hit factors individually. Destroying a type of sections might spoil your complete object. For instance, a Gargantuan statue of a human may topple over when one in all its Massive legs is decreased to zero hit factors.

So would a ship not work equally? In the event you used a spell to blow a gap into the facet of the ship, might you not make it replenish with water and sink? Spells like Meteor Swarm come to thoughts, on common it’ll do round 160 injury (I imagine it additionally applies to things), this isn’t sufficient to destroy most ships (honest sufficient, the blast is just too small), however certainly it might destroy sufficient of the hull to sink most vessels, no?