Six people are living underwater for 31 days

Can man live under the sea? Apparently so.

Mr Fabien Cousteau and his five-man crew are living in an underwater laboratory in Florida Keys, US.

They are two days into a 31-day underwater expedition called Mission 31.

Their aim? To conduct experiments on nearby coral reefs, film a documentary and study the effects of a prolonged underwater stay on the human body, according to Huffington Post.

The expedition was inspired by Mr Cousteau's grandfather, famous explorer Jacques Cousteau, who went on a 30-day underwater expedition in the Red Sea in 1963, reported BBC.

The science laboratory that the crew is living in is 2.7m by 12.2m and is 18m below the ocean's surface.

Here are five things about living underwater on the Aquarius Reef Base​.

1. There's air-conditioning. 

 Apparently life in Aquarius is very difficult and they "have an air conditioner on all the time just to try to keep the living quarters semi-dry". 

2. There's also Wi-Fi.

If you're worried about not being able to check Facebook, YouTube or Instagram, don't be. 

Since Mission 31 has a live stream of their stay, you are guaranteed Internet access 18m below the ocean's surface. We're not too sure about the speed though.

3. Staying underwater costs a bomb.

US$400,000 (S$500,000) a month, to be exact.

Ouch.

4. You can't just wear anything you want.

You have to wear scuba gear every time you exit the door.​

Very troublesome.

5. The food is bad.

Think freeze dried, astronaut-type meals and canned food. Three times a day, every day, for a whole month.