Sid generates a shipwreck in a snow biome, and you do not even have to dive under water. There are many useful loots in chests: a treasure map, enchanted items, and much more. Nearby you can find ocean ruins with another map. Also, near the spawn point, you can find a needle (180 ~ 190) and a village in the taiga (350 ~ 140).
How to use Shipwreck in a Snow seed
Start the Singleplayer mode
Select ‘Create New World’
Then click on ‘More World Options…’
In the ‘Seed for the World generation’ field, enter -6101751204728370911