Open the "survivor"training mode. once inside, go to either of the two balconies. Do you see that ramping grate that looks something like this?

Well, jump on top of it and climb up till you can’t climb up it no more!

Then (and this is the hard part) turn slightly to the left while still moving forward. It’ll take MANY attempts but you should see yourself fall through and land on some invisible floor a foot or two below the map. You can still hurt and be hurt by enemies and to get back up walk through the entrance to the balcony. Here are some pictures of what you’ll see:
http://www.maj.com/gallery/lethis66/MPHFHG/dscn1808.jpg
http://www.maj.com/gallery/lethis66/MPHFHG/dscn1811.jpg
http://www.maj.com/gallery/lethis66/MPHFHG/dscn1812.jpg
http://www.maj.com/gallery/lethis66/MPHFHG/dscn1821.jpg
http://www.maj.com/gallery/lethis66/MPHFHG/dscn1830.jpg
Yeah, the pictures suck, I'll try to get better ones later....
Have fun, and see if you can find more glitches for this game. The ramp is over one of those morphball shoters, but I am yet to find the entrance to it, though I think its in that top room.[/img]

