AquaBlock is almost like a SkyBlock in Minecraft BE, just harder. You will begin to play MCPE in the middle of the ocean and at a decent depth. The same familiar island, only “floating” in the water. The same chest with buns in the MCBE, the same starting loot on the map.
Only AquaBlock requires a different logic. First of all, in Minecraft Bedrock Edition you need to make an “air pocket” so as not to drown. The map requires several rules of the game from you: do not play in creativity, do not set peaceful difficulty and do not cheat. And, of course, do not leave the ocean. As soon as you see the surface texture – turn back.