Response efforts to the Francis Scott Key Bridge collapse may prove more difficult than first anticipated, outlined U.S. Coast Guard Rear Admiral Shannon Gilreath at a press conference Monday afternoon.

Last Tuesday, the Dali, a vessel roughly the size of the Eiffel Tower, collided with the Key Bridge, causing the bridge to collapse.

Now, thousands of tons of steel must get up from the wreckage; the process of lifting that debris is underway.