In order to obtain the Heart of the Sea, the player can search for it in Treasure Chests. The texture of heart of the sea has been changed. Crafts. Added heart of the sea as an item obtainable in buried treasure chests. It can be used to craft a Conduit.

Trivia.
It is used to make a conduit! It is used to craft Conduits.

It cannot be used to craft conduits yet. You might wonder what exactly the "Heart of the Sea" does in Minecraft and it's rather simple.

It wasn’t until Phase Two of the Update Aquatic, which went live in July 2018, that the Heart of the Sea was given a purpose. However, this mysterious item had no real use in the game, other than looking pretty. Minecraft What Heart of the Sea Does. In a crafting table, put a heart of the sea in the middle square, and surround it with nautilus shells. As of Update 1.4, the Heart of the Sea has no use, … Obtaining. It is unobtainable though since the nautilus_core has not been added into the game yet. Heart of the sea can now be used … These are blocks that when activated, give nearby players the Conduit Power status effect and it attacks hostile mobs. The Heart of the Sea can be obtained by locating Buried Treasure. The Heart of the Sea is a rare item that was added to Minecraft in May 2018, as a part of Phase One of the Update Aquatic.