According to Julius Caesar the Gauls took refuge in these caves during the resistance. Source: Internet
A cavern is a specific type of cave, naturally formed in soluble rock with the ability to grow speleothems. citation Speleology is the science of exploration and study of all aspects of caves and the cave environment. Source: Internet
After explosives ripped through the facility in 1947 causing caves and tunnels to collapse, the Swiss army rebuilt it in 1953. Source: Internet
Also present in the south and northwest is limestone with magnificent caves. Source: Internet
After Iwo Jima, it was estimated there were no more than 300 Japanese left alive in the island's warren of caves and tunnels. Source: Internet
After the battle in mid-May 1942, roughly 3000 soldiers and civilians not evacuated by sea were besieged in a series of caves and tunnels in the nearby Adzhimuskai quarry. Source: Internet