A Florida man has lived underwater at the bottom of a 30-foot lagoon for more than 74 days. He plans to make it to 100, and says the thing he misses the most is the sun.

• Joseph Dituri, a Florida-based professor, broke a world record for the longest time living underwater.
• Dituri has spent more than 74 days at the bottom of a lagoon and plans to do so for 100 days.

A professor from a university in Florida broke the world record for the longest time living underwater after he remained submerged in a lodge at the bottom of a lagoon for more than 74 days.

As of Saturday, Joseph Dituri had spent 74 days living in the Jules' Undersea Lodge — a dwelling at the bottom of a 30-foot lagoon in Key Largo, per Reuters. But he plans to remain in the lodge for 100 days.

The professor of biomedical engineering in the University of South Florida posted on Twitter that he had broken the world record on Saturday.

His post was designed to look like a transition slide in a "SpongeBob" episode, saying: "Seventy-three days later... He has 27 more days to go!"

In his tweet, Dituri wrote: Today I broke the world record for living underwater. The curiosity for discovery has led me here."

The previous record for the longest time spent underwater was set by two Tennessee professors, Bruce Cantrell and Jessica Fain. They stayed at the same lodge Dituri's now living in for 73 days in 2014, per the Associated Press.

The lodge was originally built as an underwater marine research laboratory, before being converted to become a lodge in 1986, per Florida Keys News.

Dituri, who is also a diver and a medical researcher, wanted to study how the human body reacts to staying underwater under extreme pressure for prolonged periods of time, per CBS News.

"My goal from day 1 has been to inspire generations to come, interview scientists who study life undersea and learn how the human body functions in extreme environments," Dituri wrote in his tweet on Sunday.

He spent his 74 days underwater eating protein-heavy meals of eggs and salmon, exercising, and lecturing over 2,500 students in online classes about marine science and biomedical engineering, the AP reported.

He has also been tweeting about his underwater experience, including a video of how he works out in his lodge, and a seemingly humorous post about how he has developed "pre-gills" on his neck and "webbing" between his fingers.

While Dituri plans to continue his mission, dubbed "Project Neptune 100," for 100 days, he says he sorely misses one thing every day — the sun.

"The thing that I miss the most about being on the surface is literally the sun," said Dituri, per the AP.

Dituri did not immediately respond to Insider's request for comment.