|New UK Polar Vessel, as yet unnamed|
Boaty is a bit of an icebreaker. It can push it's way through one meter thick ice at three knots, which is good since you are going to be floating in freezing water most of the time. Polar Star, our one heavy icebreaker can handle ice twice that thick. More icebreaker posts.
Update May 2016 replaced missing picture. This one has the new name on it, and no, it's not Boaty McBoatface, unfortunately.