In this seed you will be able to find an ocean monument very close to spawn. The ocean monument is a new type of structure which generates at random in Minecraft worlds similar to villages and desert temples. It's only available for users for of 0.15.9 and above. As of now only Android users are able to access that update.
Found by: dollardagreat
The spawn is on a small survival island far out in the ocean. Begin by drinking a nightvision potion. You will obviously need to be in creative mode to obtain the potion. Fly diagonally to your right and look straight down at the water and you should soon be able to see the ocean monument down in the water.
As soon as you dive into the water you won't see much until you get closer to the monument. There's an entrance on the front so aim for that.
Inside the monument you will find an Elder Guardian and normal Guardians which are two new types of mobs in Minecraft PE 0.15.9 (and 0.16.0). The mobs are hostile so make sure to bring some weapons if you intend to do all this in survival mode.