It is currently possible to walk right off the left side of the ship from the blue mushroom to the Micropolis.
[hide="The Amazing Flying Victor"](http://i.imgur.com/nTQt4im.png)[/hide]
As far as I know this is possible on all ships.
This is a very old NWN issue, just don't do it.
It's useful to keep for monsters spawning in.
Locked before TNVW tells that old anecdote about the time he did that emoting *flying* and I dunked (drowned him?) in the Dark Lake in original EFU.