Aerial footage shows the devastation caused by the Baltimore bridge crash as authorities continue salvage efforts on April 4.

The video shows the extent of damage to the bow of the cargo ship that hit the bridge and a segment of the collapsed truss, showing the challenges faced in the aftermath of the disaster.

The Dali vessel reportedly lost power before ramming into a support pillar of the Francis Scott Key Bridge, plunging the structure into the river as it fell apart within seconds early morning on March 26.

The ship's pilot reportedly issued a 'mayday call' minutes before the collision, allowing Maryland transportation officers to stop oncoming traffic onto the bridge.

Officials are still searching for at least six people believed to be trapped in the wreckage of the bridge.

The National Transportation Safety Board (NTSB) said that central to the response efforts is the meticulous removal of debris from the Key Bridge, a 'task undertaken with precision and urgency'.

They added: 'The primary objectives of the Key Bridge Response Unified Command remain steadfast: safeguarding the well-being of the public and first responders, ensuring accountability for missing individuals, facilitating the safe restoration of transportation infrastructure and commerce, preserving the environment, and aiding in the investigation process.'