The hatch.
The first animal in space was a dog called Laika. It was on the third of November, 1957. Check out the link below for more information on this.
the door
Chimney!
yes
The hatch.
You fall through a trap-door into a space below the platform.
Abdominal cavity
The outer door is a storm door.
See link below!
The Door Below was created in 1997.
The Door Through Space was created in 1961.
The Door Below has 333 pages.
The Door Through Space has 132 pages.
a door found below
The ISBN of The Door Below is 1-878252-30-5.
Osmosis ; see related link below .