This is the Torah: when a man dies in a tent, all who come into the tent and all that is in the tent shall be unclean seven days.
Torah Temimah: Sukkah 21a — “Ohel” “ohel” — this includes even a tent that is not made by human hands.
English: “Ohel” “ohel” — this includes even a tent that is not made by human hands.
Inclusion from the repeated language.
A natural overhang or cave can function as an “ohel” for the purpose of conveying corpse impurity, even if it was not constructed by human hands.