21C MYSTERIOUS ISLAND BUBBLE MACHINE ROOM. A vending machine is against the east wall. A coin slot will accept gold crescent coins only. After a gold crescent is deposited a bubble will emerge out of a hole near the top and land on the head of the person who paid the money.
These bubbles will envelope the character's head. They hold a heavier-than-water super-oxygen mixture that will allow a person to survive underwater for 1d6+12 hours. After this they will pop.
The bubble machine can be hacked apart. There will be 14 gold crescents inside plus whatever the characters deposited. This will make the machine inoperable.
Hole number 2 will deposit falling characters on the floor here. The fall is about 25 feet. Luckily there is thick carpeting and there is only 1d6 damage.