They were almost in deep ship!

A luxury superyacht capsized in the Chesapeake Bay near Washington DC, forcing passengers to plunge into the water as it sank — prompting a dramatic rescue, authorities said.

The splashy 122-foot vessel, known as the Lovebug, began taking on water at around 12:30 p.m. Saturday near Edgewater, Maryland, police and witnesses told CBS Baltimore.

Striking footage shows the $8 million superyacht — which docks at the Annapolis Yacht Club and costs $125,000 to charter per week  — sinking on its side in a heavily traveled area near the mouth of the West River.

Trevor Hardman was in a boat nearby when he realized folks onboard were up a creek.

“It slowly started to list and lean over to one side,” Hardman, who works at Boat Annapolis, told the station.

“I would say within four to five minutes the boat was consumed and the captain had made the determination that they needed to abandon ship.”

All five people on the yacht, who were not identified, jumped into the water from the stern of the vessel as Hardnman radioed for help, he said.

They were all pulled to safety by first responders with no major injuries, the station reported.

The captain, who was not identified, was baffled by what may have caused the yacht to capsize, said Hardman, who  spoke to the seaman after he was plucked from the bay.

“In the moment, I was like, ‘Did you run aground? He was like, ‘No…We were taking on water,’ Hardman said. “Boats of that size have alarms that tell you when there’s water inside the boat.”

Police are now investigating what caused the nautical mishap.

“The biggest thing now is just to get the vessel salvaged so that we can hopefully get some clues as to what happened,” said Cpl. Christopher Neville, of the Maryland Department of Natural Resources Police.

The Italian-made yacht, which was previously named Anastasia M, features jet ski storage and a small pool along with enough room to host 11 guests and seven crew members, according to boatinternational.com.

After the vessel capsized, first responders set up barriers around the yacht to contain a potential fuel leak, but authorities don’t believe any spilled, CBS reported.

One person aboard the yacht complained of head soreness after the rescue but declined to  go to the hospital.

 “It could have been a lot worse had everybody not remained calm and spoke on the radio and were clear to make sure that everybody was accounted for,” Hardnman said.

The marine service Towboats U.S. also helped with the rescue, he said