A team of scientists from Swansea University is returning to Antarctica to study lakes under the ice.
Melt water forms lakes that have been growing on the world’s fourth largest ice shelf.
This is the second of two expeditions the first of which, in 2014, discovered frozen melt lakes up to 45m deep.
The Larsen C Ice Shelf, where the team will be based, covers an area two and half times the size of Wales.
It's the largest on the Antarctic Peninsula and scientists are keen to find out if it's changing. The formation of surface lakes is believed to have played a part in former ice shelf collapses.