A six-year-old girl nearly drowned at the Queens Spa Castle this afternoon when her hair got caught in a pool vent.

An FDNY spokesperson said that emergency medical services responded to a call to day spa's College Point location at 1:43 p.m. and arrived to find that the child had already been removed from the water. She was transported to New York-Presbyterian Queens in serious condition.

Witnesses told ABC that her hair got stuck in an underwater vent, and she was blue when she was pulled out of the water. Another spa patron reportedly performed CPR on her.

Unlike the midtown location, which requires all guests to be at least 10 years old, the Queens spa castle does not have an age restriction, and offers discounted rates for children under two years of age.

The location does have a kiddie pool, which, according to its website, is monitored by lifeguards. It was not immediately clear whether the girl was swimming in the kiddie pool or in one of the spa's other aqua facilities, or whether the latter also have lifeguards.

In December 2014, an 84-year-old man was found dead at the bottom of one of the spa's rooftop hot tubs. Witnesses to that incident said that no one immediately noticed when he went under, and spa staff had to go get a booklet with instructions on how to perform CPR.

Spa Castle's owner said that three employees present today were certified in CPR. The location has five pools on the floor.