You can only find the heart of the sea in a treasure chest hidden underground. These may not seem important at first, but don't throw them away! Heart of the Sea is so rare that it can be used to build a pipeline.

The conduit is a carefully crafted structure that provides a variety of underwater enthusiasts, similar to a lighthouse. There is a pipe nearby where you will have water to breathe, night vision, and hurry underwater. In addition, pipes will attack nearby enemy creatures.

To make a catheter, you need the following materials.

The heart of the sea

Eight nautilus shells

Nautilus shells are also a bit harder to come by. You can buy five emeralds at a street dealer, but they only sell five. A drowned creature has a 3% chance to hold a cannonball and always drops it upon death. Finally, nautilus shells can be caught by fishing, but they are rare items that take some time to catch.