Moby Dick

Moby Dick is Whitebeard's main flagship. Its name was revealed in One Piece Yellow Grand Elements.

Ship Design and Appearance
Like the rest of the four main ships of Whitebeard, the Moby Dick is a large battleship with a blue whale figurehead. It is however significantly larger than the other three and possesses a blue whale figurehead colored white. It originally appeared in the anime with the ship and figurehead colored blue like a regular blue whale. Later in the anime however, the figurehead was changed to white.

History
With Whitebeard controlling a territory within the New World, the Moby Dick sailed through the waters of the second half of the Grand Line.

After Rockstar, a member of Shanks' crew, had an audience with Whitebeard himself aboard the great vessel, the Moby Dick sailed to meet up with Red Force so that Whitebeard and Shanks could talk properly. Upon breaking through a Marine blockade, the two ships met up so that their captains could discuss about Teach and Ace.

After the meeting between the two captains, the Moby Dick continued its regular course. However when it was reported that then captured Ace would be executed, the Moby Dick and the rest of Whitebeard's fleet was steered towards the locale of the anticipated execution, Marineford. Living to Whitebeard's strength, the Moby Dick destroyed 23 Marine battleships sent to hinder its progress as it drew closer.

Along with 43 other ships belonging to New World pirate crews allied with Whitebeard, the Moby Dick and the three other main ships of Whitebeard were coated and traveled to the first part of the Grand Line through Fishman Island. With this massive pirate fleet, Whitebeard's forces invaded Marineford on the day of the execution. While Whitebeard's allies resurfaced after passing through the Red Line, the Moby Dick and the three other main ships continued traveling underwater until they arrived directly into the middle of the bay of Marineford. Having done so, the Moby Dick and the other ships bypassed the large battleship blockade surrounding the island. With the Moby Dick and the rest of Whitebeard's forces arriving in Marineford, the battle to save Ace began.

Trivia

 * Its name and design is based on the classic tale "Moby Dick"
 * So far, it is the second largest ship seen in the series, the first being Gecko Moria's Thriller Bark.
 * This is the second pirate ship shown to have the ability to travel underwater.