Caves were Used as Places of Concealment
Source: TTT
1 Samuel 13:6
Seeing that they were in danger because their troops were hard-pressed, the men of Israel hid in caves and thickets, among the rocks, and in cellars and cisterns.
1 Samuel 14:11
So the two of them showed themselves to the outpost of the Philistines, who exclaimed, “Look, the Hebrews are coming out of the holes in which they were hiding!”
1 Kings 18:4
for when Jezebel had slaughtered the prophets of the LORD, Obadiah had taken a hundred prophets and hidden them, fifty men per cave, providing them with food and water.)
Hebrews 11:38
The world was not worthy of them. They wandered in deserts and mountains, and hid in caves and holes in the ground.