One of the easiest ways to get a rare heart of the sea, prismarine, TNT and a bunch of other buried treasure is by way of the shipwreck at spawn in this Java Edition Heart of the Sea seed!
Badlands on the Water (Java Edition Seed)
This Minecraft Seed for Java Edition spawns you into a badlands biome that is surrouned by ocean, subdivided by rivers and packed with abandoned mineshafts!
Ocean Ruin on Turtle Island
In this Minecraft Seed featuring a land-based ocean ruin you spawn on a small island inhabited by turtles. Just offshoe you’ll find two more underwater ruins. All have chests.
Shipwreck in the Land of Ice Spikes
This Minecraft Shipwreck seed spawns in one cold world. The world is either coated with snow, ice spikes, ice or cold water. Be sure to grab the ship’s buried treasure map. For Minecraft 1.13 for Java Edition.
Badlands Island Chain Minecraft Seed
Spawn on a small badlands island biome in this Minecraft Java Edition Seed for Minecraft 1.13+. The island is one in a chain of badlands islands.