Survival Island with a massive cavernsystem

Hello, please meet the big brother of Aldea Plox. 

An island, definitely not a small island, with nothing else comparable in the vicinity. A nice island with a few trees but plenty of room to survive.
And there is this: It is sort of hollow.

You spawn near a cave, this cave spans at least half of the green part of the island. It includes plenty of iron and coal to have a good start and makes for a decent hideout.

And then, then there is also this: There is also a massive cavern.

Near the beach close to the gravel, you can dig straight down and enter a massive cavesystem that stretches out underneath the ocean. Plenty of redstone, gold and diamonds to be found (less than a minute adventuring in creative mode found me at least 15 diamonds). 

Regards,

Brainshard