The Crondis tomb can be reached after completing Crocodile Tears. The entrance can be accessed from within Crondis's pyramid by swimming through the underwater tunnel east of the entrance. It requires level 80 Constitution to enter. It contains the Crondis mask and Nekhakha. Entering the Tomb for the first time awards the player 20,000 Constitution experience.
Accessing the Crondis tomb is a requirement for the master quest cape, Under Croc and Key.
The Entrance to the Tomb inside Crondis Pyramid