Investigations are continuing after more than 30 people were rescued or had to swim to safety when an amphibious tour bus sank in Liverpool's Albert Dock.
A number of people were taken to hospital after the Yellow Duckmarine vessel went under just before 4pm on Saturday.
A "multi-agency investigation" has been launched into the sinking - the second in three months.
A rescue operation - involving police, ambulance, coastguard and the RAF - was mounted by the emergency services and 31 people were helped out of the water.
Of those, 18 people were taken to The Royal Liverpool Hospital for treatment, mostly for shock, but all were well enough to be discharged. Nobody was trapped inside the vessel, the fire service said.
The company runs tours on the city's roads with the promise of a "splashdown" ending.
It is understood that 28 people were led to safety from the vessel, including a baby whose mother held her above the water on the roof of the sinking craft. Three more were saved from the water by firefighters.
A spokesman for Merseyside Police said everyone had been accounted for, adding: "A multi-agency investigation into the full circumstances of the incident is ongoing."
Eyewitnesses reported seeing a large number of people swimming in the Mersey as the vessel, one of four in the company's fleet, 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.
In March, the entire fleet was ordered out of the water after a bus, which was not carrying passengers, sank.