One child is in critical condition and one is in serious condition Saturday night after a boat they were on capsized this afternoon in San Francisco Bay, fire and hospitals officials said.

The U.S. Coast Guard received a call at 4:02 p.m. that a 34-foot boat named Khaleesi had overturned about 100 yards off Pier 45. Thirty people, including three children, were on board.

Some were trapped under the hull, but bystanders, police, firefighters and Coast Guard crews rescued all 30 in 32 minutes, U.S. Coast Guard spokeswoman Lt. j.g. Nicole Emmons said.

“This could have been really, really catastrophic,” San Francisco Assistant Fire Chief Bob Postel said.

A woman and a 4-year-old boy were pulled from the cabin of Khaleesi before it sunk.

The child was unconscious and was not breathing when he was rescued. He was revived before being taken to Zuckerberg San Francisco General Hospital where he is in serious condition, Postel and San Francisco Public Health Department spokeswoman Rachael Kagan said.

The boy’s brother, mother and father also were treated at San Francisco General Hospital and were released, Kagan said.

When fire officials became aware of the accident, they declared a red alert so all area hospitals were aware of it.

In all, five adults and the three children were hospitalized. Fire officials did not say where the other child and three other adults are hospitalized.

Some first responders were conducting safety patrols on the water nearby because of Fleet Week and were able to respond quickly.Bay Area News