Man who lived underwater for 31 days, Fabien Cousteau, might just be one of the bravest in the world. Cousteau, now more known as the man who lived underwater for 31 days, went on the mission to conduct marine experiments inside an underwater lab. Together with his film crew, they explored marine life 20m underwater for a month, broadcasting everything about the mission online, reports ABC News.

For some people, living underwater, like the man who lived underwater for 31 days, might be enough of an accomplishment. However, Cousteau's repertoire of successes wouldn't stop there.

According to redbull.com, apart from being the first man who lived underwater for 31 days, Cousteau has also built submarines that look like sharks, spent his childhood with famed oceanographer and grandfather Jacques-Yves Cousteau aboard the fabled research vessel Calypso and scuba-dived at the tender age of four. Let's not forget to mention that the 14-foot shark-shaped submarine he designed, he also piloted in order to swim amongst great whites for the CBS television special, "Mind of the Demon."

A filmmaker and ocean explorer, the life of the man who lived underwater for 31 days is nothing short of exciting. For the underwater mission, Cousteau spent a month aboard the NOAA Aquarius Reef Base off Key Largo, Fla.

After spending the marathon 31-day mission underwater in the Florida Keys, the man who lived underwater for 31 days just set foot on dry land on Jul. 2. According to ABC News, Cousteau amazingly said at a news conference that he wished he could have extended his stay.

He said, 'I personally would have loved to have continued beyond 31 days. I didn't know how I was going to react -- physically, psychologically. And it was amazing how much it felt like home.'

Imagine this - the man who lived underwater for 31 days had no sunlight and fresh air, he was under cramped conditions and food which can only be described as bland - for a month after embarking on his 31-day mission last month.

News.com.au reports that Cousteau stayed 60 feet below the ocean's surface and inside a school bus-sized laboratory as he attempted to break his grandfather's record of longest time spent in an underwater lab without going to the ocean's surface. His grandfather, the famous marine explorer Jacques-Yves Cousteau spent only 30 days underwater.

According to ABC News, the life of the man who lived underwater for 31 days, during those 31 days has been kind of bleak as he and his team lived on freeze-dried food and other rations.

Cousteau said, 'Of course we all missed our families and friend. But it was such a unique experience and something I wish, hope in some way we were able to gift to the world -- so they could peek into this unusual thing we did and feel like they were part of the mission.'

Because of the mission, Cousteau was proud to announce that he and his team were able to gather enough findings for an estimated ten new research papers.

He said, 'The luxury of time is an enormous asset when you're trying to learn more about an alien environment.'

Despite being an extremely unique mission for the man who lived underwater for 31 days, Mission 31 is not all about lasting long in subterranean living. Cousteau and his five other aquanauts conducted science experiments as well - studying sea life, effects of pollution and climate change on the nearby coral reef and effects of long-term living underwater, says reports.

ABC News said that the Aquarius laboratory is the only and last remaining underwater marine laboratory in the world. It is operated by Florida International University. Despite measuring only 46 feet long and 10 feet wide, it has reportedly been used for 21 years by scientists and astronauts.

In essence, the man who lived underwater for 31 days wasn't completely cut off from civilisation as the lab has a working kitchen with microwave and refrigerator, six bunk beds, hot water, air conditioning, computer and even Wi-Fi, which he used to tweet about his experiences below.

Cousteau also reportedly welcomed visitors, including his father, Jean-Michel Cousteau, sister, Celine and actor Ian Somerhalder.

Despite being sheltered from harm, the man who lived underwater for 31 days also had a wild encounter. When asked about this, Cousteau described an instance where a 600-pound goliath grouper made a booming sound and bit a four-foot barracuda.

Cousteau said, 'I've never seen aggressive behaviour like that from a grouper before. And while we were diving, we saw massive, swirling clouds of plankton blooming at night. They looked like tornadoes and snowstorms.'

The mission, whom Cousteau clearly successfully accomplished, came 50 years after his grandfather Jacques Cousteau conducted a similar experiment living at the bottom of the Red Sea for 30 days. Jacques' experiment however was to prove living underwater for such a period of time has no ill effects.

According to news.com.au, the documentary called "World Without Sun" garnered an Oscar win. However, Jacques' mission involved returning to the water's surface to deliver film tapes. With his grandson, the man who lived underwater for 31 days, the mission was reportedly 30 metres deeper and had no trips whatsoever to the surface. This mission is reportedly the longest a film crew have stayed underwater without interruption.

Cousteau Fabien, like his grandfather believes that interest in the oceans is currently in the process of being revived as the effects of climate change are now disrupting more and more life on land.

Cousteau said, 'Whether you care about economics, in your personal life or your business life, whether you care about your health or your child's health, whether you care about saving creatures, it all pertains to making sure that our oceans are healthy. And our oceans are not.'

Man who lived underwater for 31 days documentary about Mission 31 is expected to be released at the BLUE Ocean Film Fest in St. Petersburg, Fla. this year November.

To see a glimpse of what it's like to be inside the "Aquarius", see video below.