The Titanic is overrated, deep-sea explorers say. The wealthy keep venturing to it anyway.

“Dean’s Blue Hole is an enigma for geologists studying underwater caverns,” Blue Marble Exploration’s website says. “It is the largest of its kind in the world, and yet very little is known about it, including how it formed more than 15,000 years ago.”

The company adds that it expects to find “human remains” of people who drowned in the blue hole “due to a variety of misfortunes.”

It’s unclear how many people died at the site. The most notable case occurred in 2013 when American freediver Nicholas Mevoli attempted to break a freediving record by reaching 72 meters in a single breath, The New York Times reported. Mevoli surfaced but died shortly after.