Polar Tang is not a human character but rather the name of the submarine ship used by the Heart Pirates in the anime and manga series One Piece. Captained by Trafalgar D. Water Law, the Polar Tang serves as both a vessel and a mobile medical facility for the crew. Its advanced technology and stealth capabilities make it crucial for the Heart Pirates’ operations, especially during underwater missions. The Polar Tang plays a significant supporting role in various arcs, aiding the protagonists in their adventures.