A state-of-the-art polar research ship to be operated by the Cambridge based British Antarctic Survey, has reached a major milestone in its construction.
Broadcaster and Naturalist Sir David Attenborough launched the vessel into the River Mersey for the first time.
More work still needs to be done onboard the 129 metre long ship which has been named after Sir David. Originally people had voted to call it 'Boaty McBoat face' in an online poll.
The research ship is part of a £200 million investment by the Government in polar research, to look at the effects of climate change.
The ship will now be towed by tugs to a wet basin for the next stages of construction. The ship is not expected to come into operation until 2019.