In the London Underground level, you can grind up the
rail in the second main room that leads to the top platform in
the room. Once you grind that, jump off at the very end and land
on the edge of that ledge. You will float upside down on the ceiling
for a few seconds, just like Jack The Ripper from Shadow Man.
UHS file
Note: The Universal Hint System
reader must be used to view this file. A HTML preview version
is also available for direct viewing through the UHSWeb
service.