Moon pool

Okay kiddo, have you ever seen a swimming pool with a hole in the middle? Well, a moon pool is like that but it's used for something different. Instead of swimming, it's used for underwater machines and vehicles.

Sometimes, people want to send robots or submarines deep into the ocean to explore or do work, but it's hard to get them in and out of the water. That's where a moon pool comes in. It's a big hole in a ship or platform that goes all the way down to the water, so machines can be lowered in and out easily.

Plus, since the water is always moving, it keeps everything fresh and cool. So basically, a moon pool is like a special kind of swimming pool for really cool underwater machines.