This is just a quick underwater structure inside a lagoon, its quite secret however the door should be open when you load it, the switch is behind the oddly placed dirt block to the right of the entrance :) hope you like it and its ready to be filled with whatever you want. just leave a message saying if you me to update it with diamonds and items inside the vault, also to get inside the actual vault just push a button and walk into the wall at the next block left of the button :) Enjoy !