hatchway

kansiluukku A means of passing through a wall or floor, having a hatch (especially on a ship); a doorway with a hatch rather than a door
1924, (w), (w), London: Constable & Co., Chapter 22, http://gutenberg.net.au/ebooks06/0608511h.html

Up through the great hatchways rimmed with racks of heavy shot, the watch below came pouring (..)