This is one of those rare (and extremely weird) seeds which sometimes gets submitted to the website. Not far from spawn you will be able to find two floating monster spawners in a mesa biome. They are literally floating in air above the ground. I have never seen anything like it before. It’s a pretty cool seed!
The spawn is on a medium sized survival island. But that’s probably not the reason why you decided to check out this seed. To find the floating monster spawners walk diagonally to your right and then swim across the sea until you get to a mesa biome.