Video posted on You Tube shows the moments after a 'Yellow DuckMarine Tour' sank in the Albert Docks in Liverpool yesterday.
The video shows the speed with which the boat sank as the 31 passengers who were aboard scrambled to get out and swim away from the stricken amphibious vehicle.
Albert Dock Duck incident, look I will not make any official comment on future of these ducks until we know people are all ok+accounted for
An investigation has been launched after the Yellow Duckmarine tour boat sank today, forcing its 31 passengers to be rescued or swim to safety.
– A spokesman for Merseyside Police
A police cordon remains in place at the scene and a multi-agency investigation into the full circumstances of the incident is ongoing.
– Spokesman for Yellow Duckmarine
The craft has now been recovered and following consultation with MCA it has been taken to a place of safe and secure storage in order that a full investigation can take place. That will continue tomorrow morning.
We would also like to express our thanks to the emergency services and the Albert Dock security team onsite for their immediate and exemplary response.
Eyewitnesses have reported seeing a large number of people swimming in the Mersey as the tour boat sank in Salthouse Dock, part of the Albert Dock complex.
People could be seen throwing life-rings into the water to help those trying to escape.
More than 30 people were rescued and 27 people were taken to hospital, mostly for shock, but all were well enough to be discharged, North West Ambulance Service have said.
A baby was said to be among the 31 people rescued when a tour boat sunk in Liverpool. The baby's mother is said to have held her above the water on the roof of the sinking craft.
More than 30 people were rescued or had to swim to safety when the amphibious tour bus sank in Liverpool's Albert Dock.
Emergency services launched a rapid rescue effort in Liverpool's Albert Dock after an amphibious vehicle sunk with 31 passengers on board.
Just last year, the Queen herself was a passenger on one of the so-called "duckmarines" to mark the launch of the tourist attraction.
ITV News reporter Amy Welch reports:
A spokesman for the Albert Dock in Liverpool said they were "pleased" that all 31 passengers and two crew were rescued safely.
Following the incident, Albert Dock directors would like to praise the response of the emergency services and its onsite security team and will co-operate fully with any investigation.