1 / 4   A team of international scientists led by the British Antarctic Survey (BAS) is headed for Antarctica to explore a mysterious marine ecosystem that has lain hidden under an Antarctic ice shelf for up to 120,000 years. /VCG Photo

2 / 4   Known as A68, the iceberg broke off from the Larsen Ice Shelf in 2017, revealing a seabed which measured nearly 5,900 square kilometers – four times the size of London, according to the BAS. /VCG Photo

3 / 4   Some creatures in the ecosystem were discovered in exposed sea during a BAS research cruise in 2015. /VCG Photo

4 / 4   The team will collect seafloor animals, microbes, sediments and water samples for further research. /VCG Photo