Britain has a new tallest mountain.
Mt Hope, which is sited in the part of the Antarctic claimed by the UK, was recently re-measured and found to tower above the previous title holder, Mt Jackson, by a good 50m (160ft).
Hope is now put at 3,239m (10,626ft); Jackson is 3,184m (10,446ft).
Dr Peter Fretwell from the British Antarctic Survey spoke with our science correspondent Jonathan Amos.