A survival seed, spawn on the small island with some necessary tree to craft some tool and build a house protected you from scary monster in the night. But don’t use to much wood for your base you need tool going underground of the island. In there, you will find a mineshaft connected with it is a dungeon. From the spawn dig down like the image below after some minutes digging you will entrance to the mineshaft. Walking around, soon you will find a dungeon connected with the mineshaft. In the dungeon haven’t chest but if you kill the zombies they will drop some good items.
Seeds : 1484684355 Work in PE ver0.10.5 or ver0.11.0+