'Recesses' in the Bible

On the way he came to the sheepfolds where there was a cave; and Saul went in to relieve himself. Now David and his men were sitting in the cave’s innermost recesses.

‘Through your messengers you have taunted and defied the Lord,And have said [boastfully], “With my many chariotsI came up to the heights of the mountains,To the remotest parts of Lebanon;I cut down its tall cedar trees and its choicest cypress trees.I entered its most distant lodging, its densest forest.

“Have you entered and explored the springs of the seaOr [have you] walked in the recesses of the deep?

“But [in fact] you will be brought down to Sheol,To the remote recesses of the pit (the region of the dead).

“Through your servants you have taunted and defied the Lord,And you have said, ‘With my many chariots I have gone up to the heights of the mountains,To the remotest parts of Lebanon.I cut down its tallest cedars and its choicest cypress trees;And I will go to its remotest height, its most luxuriant and thickest forest.