Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
The Langun-Gobingob Cave System also known as Calbiga cave is a cave system located at Calbiga within the Samar Island Natural Park. It covers an area of approximately 2,968 hectares. The cave system has 12 caves including Langun, Gobingob, Lurodpon and Bitong Mahangin.