BALTIMORE (AP) — The container ship that caused the deadly collapse of Baltimore’s Francis Scott Key Bridge was refloated at high tide Monday and began slowly moving back to port, guided by several tugboats.

Removing the Dali from the wreckage marked a significant step in ongoing cleanup and recovery efforts. Nearly two months have passed since the ship lost power and crashed into one of the bridge’s supporting columns, killing six construction workers and halting most maritime traffic through Baltimore’s busy port.

The vessel appeared to start moving shortly after 6 a.m. It started and stopped a few times before slowly and steadily backing away from the collapse site, where it had been grounded since the March 26 disaster.

Pieces of the bridge’s steel trusses still protruded from its damaged bow, which remained covered in mangled concrete from the collapsed roadway.