SAN FRANCISCO (AP) — Nearly two dozen people who were enjoying a bachelor party on what's billed as San Francisco Bay's only "floating wine tasting room" are OK after their boat hit a shoal near Alcatraz Island and began sinking Friday night, officials said.

The 45-foot Neptune hit the shoal around 8:42 p.m. and started taking on water after the impact left a 1-foot gash in the side of the boat, U.S. Coast Guard spokesman Lt. j.g. Josh Dykman said.

The boat's captain tried to steer the stricken vessel to San Francisco's Pier 39. But the boat started having rudder issues and began to sink about 300 feet from the pier, Dykman said.