Thirty Marines and sailors were injured on May 1 when two air-cushioned landing craft collided during a nighttime training exercise off the coast of Jacksonville, Florida, Navy officials said.

“One Sailor remains under medical care at a hospital in Savannah, Georgia, and our primary focus is on our Sailor’s health and well-being,”  said Cmdr. Lara Bollinger, a spokeswoman for the Navy’s 2nd Fleet. “The incident remains under investigation, and we will provide more information when available.” 

The hovercraft-like transporters, which the Navy calls Landing Craft Air Cushion or LCACs, are high-speed amphibious craft that ride on a cushion of air to bring Marines and equipment ashore, according to the Navy. Each LCAC has a crew of five and can reach a top speed of nearly 50 miles per hour while fully loaded. They deploy from the well decks of amphibious warfare ships and can carry a maximum payload of between 60 and 75 tons, enough to carry any armored vehicle in the U.S. inventory, including an M1 Abrams tank.

One of the LCACs was from the amphibious assault ship USS Wasp and the other came from the amphibious transport dock USS New York, Bollinger told Task & Purpose on Friday.