It does look like inside a whale
When I was a child , I was watching a cartoon from TV called "Pinocio Adventures" . Pinocio was a wooden doll . In one part , a big whale eat the Pinocio and he walked inside the whale stomach untill he find his grandfather "Jepeto" there at the end of whale's stomach !
When I saw this part of cave , I remembered this cartoon and called it "Inside a Whale" !
I used to watch the same cartoon in Iran when I was a child. Remember the cat "Gorbeh Nareh"?