Heart of the Sea

A heart of the sea is a rare item that can be crafted into a conduit.

Crafting ingredient
Education Edition hasn’t received all of the Update Aquatic features yet, and one of them is the conduit, so hearts of the sea cannot be used to craft conduits in Education Edition.

(Update) The Heart of the sea give a status effect of “Conduit Power” which gives the player effects in water or rain such as, faster mining in water, water breathing, and night vision. Once out of range of the conduit, the effects wear off after 10-13 seconds. Adding more blocks around the conduit will increase range and start to damage any hostile mobs nearby. Completely seal the conduit in a closed box of prismarine blocks, and the eye will open.

Trivia

 * Before the release of the heart of the sea there was an entry found in the buried treasure chest loot table named  which was later revealed to be the heart of the sea. Despite the name change the heart of the sea continues to be referred to as the   in most game files.

Herz des Meeres Cœur de la mer Hart van de zee Serce oceanu Сердце моря Серце моря 海洋之心