Some of the caves of Mizoram are still unexplored and therefore shrouded in mystery and superstitions. One of them is Bak Puk, also known as Tui Lut. It is located at Project Veng within the town of Kolasib, 83 kms from Aizawl City (2Â½ hrs drive). With its vertical narrow entrance drawing in rainwater it is more like a sinkhole, but the tunnel later forms into wide caverns with awe-inspiring rock formation and deep pools which are yet to be fully explored with proper equipment. Considering the amount of rainwater that it accumultes it is amazing that it has no known outlet, thus giving rise to a legend that the entire townis on top of an underground lake. As a result nobody dared to explore it until recently, when on 29th January 2016 a group of adventurers called â€˜Zotrekâ€™ undertook an expedition to explore the cave. The cave was explored upto a depth of 100 meters and was found to have exquisite rock formation with various chambers.