— A Six Flags theme park in Missouri is challenging visitors to spend more than a day inside a coffin during an annual Halloween event.

According to the Six Flags St. Louis website, the theme park is celebrating the 30th anniversary of the Fright Fest celebration be selecting six participants to spend 30 hours inside a coffin from 1 p.m. Oct. 13 to 7 p.m. Oct. 14.

According to the rules of the contest, competitors can bring a friend to keep them company during normal theme park hours, but must remain alone once the park closes and “Fright Fest Freaks” come out to lurk in the darkness.

Anybody who gets out of the coffin, with the exception of leaving for designated bathroom breaks, will be eliminated.

The winner will receive $300, two 2019 season passes to the park and a Fright Fest prize package. The winner will also be allowed to keep the coffin.

If more than one contestant remains after 30 hours, a drawing will be held to decide who wins the $300, but all will receive the season pass and Fright Fest package.

Those brave enough to attempt the challenge can register online through Oct. 3.