BOSTON -- For the second time this summer, a large boat became hung-up on Devil's Back in Boston Harbor.

Coast Guard officials said a call came in around 2:37 p.m. Saturday that the Weymouth-based Wilhelmina had run aground about a mile from Deer Island. The area is known for its rock formation.

On board was a group of family and friends celebrating a special occasion.

Images: Cabin Cruiser Gets Hung Up On Devil's Back

“It was a joint bachelor-bachelorette party,” said groom-to-be Brad Freeman. “We decided it would be a good bonding experience for both parties to go out together."

The group had just left Marina Bay in Quincy and were two hours into their cruise when their boat hit the rocks.

"As the best man this was my responsibility to plan this party and all of a sudden I'm like this party just died,” said best man Prescott White.

Coast Guard crews, Massport Fire officials and the Winthrop Harbor Master responded to the scene where 18 party-goers were removed from the vessel.

Two people were left aboard to stay with the boat to monitor its situation, said the Coast Guard.

No injuries were reported.

The Coast Guard said the boat was taking on some water but they were standing by to assist.

Four tow boats kept the vessel righted for hours until the tide came in. The boat was then towed back to Marina Bay Sunday morning.

Coast Guard officials said a tow boat crew would remain on scene until the boat was removed from the water. The crew had to run a pump every 45 minutes for five minutes to keep the boat from filling up with water.

By 1 p.m. the boat was towed to an East Boston shipyard where it would undergo repairs for a two foot gash.

The area is the same place where the 87-foot passenger ferry the "Massachusetts" ran aground and began taking on water on July 3. Four of 168 passengers were injured in that accident.

Michael Goodridge from Towboat U.S. Boston assisted in both the tow of the Wilhelmina and the Massachusetts. He said freeing the Wilhemina was more difficult.

“This one was lodged on the rock in a different way,” said Goodridge. “It wouldn’t free itself from the rock until absolute high tide and we had to put a bunch of lift bags on it to get it high enough.”

The Coast Guard was investigating why both the Wilhelmina and the Massachusetts became grounded in Devil's Back, an area that is marked for being shallow.

"This is a dangerous area,” said Terrell. “There are rocks and the water depth can range anywhere from one to five feet depending on the tide.”

As for Freeman and his bride-to-be, they're not letting the bad experience ruin their September 18 wedding.

"We're going to be telling this story for 25 years," said Freeman.