Krem Marai is the longest cave in Meghalaya with a documented length spanning up to 427 kilometres up to what has been explored of it. The first exploration tour was led by the British explorer Lt Yule during the days of colonial India and Krem Marai was discovered during that expedition.
However, rampant limestone mining for the cement industry in the vicinity of these caves formed from several aeons of limestone deposits forming precious stalactites and stalagmites remains the major threat to the conservation of these caves. The seventh longest cave in Meghalaya was lost to extreme exploitation of resources in the vicinity for limestone and the damage is irreparable. The caves are also home to an alternate ecosystem hosting many different and rare species of birds, animals as well as plants too. Destroying the caves means destroying natural habitat of indigenous life forms that are native to this alternate ecosystem.