SUNAPEE, N.H. — Officials are still trying to figure out what cause a dinner cruise ship docked at New Hampshire’s Sunapee Harbor to start sinking.

The stern of the MV Kearsarge took on water late last week.

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Owner of the MV Kearsarge, Peter Fenton, left, examines his sinking dinner cruise ship in Sunapee Harbor Friday, Jan. 11, 2013 in Sunapee, N.H. Authorities said the ship started to go under at about 7:45 p.m. Thursday, and part of the lower deck at the back of the boat was under water Friday morning. It was not immediately known what caused the problem. The MV Kearsarge has been taking visitors around Lake Sunapee from May through October for over 30 years. (AP Photo/Jim Cole) AP

Salvage workers were able to lift the boat a bit over the weekend. The Eagle-Times reports four yellow airbag’s were placed underneath the boat. Water was being pumped out.

Several members of the Fenton family, which owns the boat, were able to step onto it over the weekend.

The ship, which has been in service since 1980, takes visitors around Lake Sunapee from May through October.