What's the use of my world in the center of the sea?

What's the use of my world in the sea? How to use my world in the sea?

The center of the ocean

A synthetic catheter for eight nautilus shells.

Build a 5x5 frame with sea spar and sea crystal lamp, and put the catheter in the middle of the frame. The activated catheter will provide the player with a buff called "catheter energy" in a certain range, which is equivalent to the combination of night vision and underwater breathing.

If the frame is built in the shape of six crosses, the activated conduit will also attack creatures hostile to the player in a small area, just like the underwater defense tower.

Note that this device will not work without water, and players will lose this buff gain without water. Equivalent to underwater locator beacon, it can only take effect underwater. Of course, it is still a bit difficult to collect these materials in survival mode.