A rare and unusual generation awaits you in this seed. Go to coordinates -350 ~ -1400 if you want to explore the underwater stronghold and the monument. Also near this place you can find a ship, which is located at coordinates -552 ~ -1464.
How to use Stronghold and Monument seed
Start the Singleplayer mode
Select ‘Create New World’
Then click on ‘More World Options…’
In the ‘Seed for the World generation’ field, enter 6748125670270857300