No, that's not the correct answer.

But is 89 m reasonable?!?

89 m is nearly 300 ft.

Do you really think there is that much of the ship underwater?!?

The "displacement" of the ship is the amount of water it displaces. That is equal to the volume of the water displaced by the amount of the hull that is under the water. Find that volume, change it to the mass of the water and set that equal to the mass of the ship, 77 x 10⁶ kg.

(c) 2000, Doug Davis; all rights reserved.