I think "hatch" is the word, but no, it is not either of those guesses. It IS something that many have seen in certain movie review magazines, and very well-known in its own movie genre. Davdud is closer in his guess, sorta...
The movie I am designing from has had sequel work before, but it never revisited this particular part of the original movie.
In fact, after starting on this little model, I found out yesterday that there is actually a sequel/prequel in the works for to the movie in question, exploring this particular part of the original movie. The sequel/prequel release was due for this summer, but got delayed until next year... The man who directed the original movie never worked on the sequel projects, but now he has taken up again to work on the prequel. Many would say he was the key to the original movie's success, and the reason that the sequel efforts did not achieve near the success of the original.