Boeing is helping develop NASA's next-generation megarocket, but inspectors have found shortcomings in that work. Meanwhile, the company's Starliner spaceship waits in space.
The flooding happens because a smaller glacier near the Mendenhall Glacier has retreated, leaving a basin of water that sometimes flows under or around the glacial ice dam.
The two astronauts were meant to stay in space for about a week, but problems with the Starliner capsule have left them waiting for more than two months.