These craft are known to travel underwater as well as the sky. And they have been around forever interacting with man both in the sky and in the sea. Jonah was aided by one of these crafts. But with extremely primitive knowledge he would have to compare it with something that it resembled to him.
A big fish.
Very interesting.
It’s also documented that while tracking them on radar that they “fly” thru solid ground.
I wonder if Jonah smells of fish bait?
;)