Submarine
from Zeldapedia, the Legend of Zelda wiki
Submarines are locations from The Legend of Zelda: The Wind Waker. They appear on the Great Sea as floating devices submerged under the ocean, not unlike in design to a barrel. Inside most submarines can be found Treasure Chests guarded by many enemies, making them the Great Sea equivalent to Grottos. Additionally, the entrance to a Submarine is usually guarded by at least one raft carrying pink Bokoblins. On certain islands with Submarines nearby, a man with a telescope known as Old Man Ho Ho can be seen observing them. A Submarine Chart which marks the locations of every one of these vessels can be found near the Boating Course.
