Blood Frenzy. The zombie megalodon has advantage on melee attack rolls against any creature that doesn't have all its hit points.

Undead Fortitude. If damage reduces the zombie megalodon to 0 hit points, it must make a Constitution saving throw with a DC of 5 + the damage taken, unless the damage is radiant or from a critical hit. On a success, the zombie drops to 1 hit point instead.

Undead Nature. The zombie megalodon doesn't require air, food, drink, or sleep.

Bite. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 22 (3d10 + 6) piercing damage.

Capsize. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 50 (8d10 + 6) piercing damage. This attack can only affect ships.