Beginning this year Karst Worlds reported how Czech cave divers made a connection between Ko'ox Baal and Tux Kupaxa, located on the Yucatan peninsula, resulting in worlds fourth longest underwater cave at 56,5 km.
The exploration continued and they now succeeded to connect the system to another cave, called Chun Che Chen, enlarging the total lenght of the cave system to over 62 km.
Read the day by day report of the expedition at Speleo Aquanaut (CZ)