Hi Cem,
yup, a lobster pod it is, and quite a sophisticated handmade construction with funnels and bate. On the hunt for the bate the lobsters creep into a larger funnel ( I must do a triptychon showing the pod in the middle and the other funnel on the left) from which the can not escape.
I am fascinated by this construction and my frined Brian McKean mentioned this to be the very same since many generations.