Now here's an original idea. And a well-executed one as well. You get into the drain and across into the room behind. There's a big fork-lift truck in there, and when you try to drive it, it goes nuts and thanks to a nicely set-up sequence, breaks through the big doors. Then, of course, you can jump on it and from it onto the platform.
Everything fits into the base map like it's supposed to be there. There's even an extra door so it looks like you came from somewhere.
A great map all round, with a lot of effort put into it... well-deserving winner of this contest!