In this seed you will spawn near the mushroom island (-148 ~ -1) and the shipwreck (56 ~ 40). Go to coordinates 90 ~ 160 to see the unusual generation. There you will find a lava pool inside an iceberg. If you want to continue your survival with this seed, do not miss the Nether portal, which is located not far from this place, at point 240 ~ 304.
How to use Lava Pool Inside an Iceberg seed
Start the Singleplayer mode
Select ‘Create New World’
Then click on ‘More World Options…’
In the ‘Seed for the World generation’ field, enter -6409425976579534800