3.7.5  Going bloopu with the UPU (TR3).

         The Underwater Propulsion Unit is available during the Lud's
         Gate level in TR3 - but isn't actually necessary to complete
         it, which is a bit of a shame really.  Being a completely
         underwater device[1] the controls are a little different to
         other vehicles.  To grab hold press action when facing it (you
         must be up close).  To let go press roll.  It has no reverse
         and only one forward gear (press jump to move forward with it)
         but it does have a neato harpoon gun built in; just press
         action to use it.

         Please note that the UPU's harpoon gun doesn't have Lara's
         autolock aiming feature - you can only hit whatever's directly
         in front of the machine.  The upside is that there is no slow
         reload time - you can blaze away without remorse (I just hope
         you have a lot of harpoons).  The UPU is just a little bit
         faster than Lara's top swimming speed so I support its use.

         [1] It is possible to actually fly up out of the water and defy
         gravity with the UPU.  Lara sort of hangs in the air behind it
         though still in the water.  She can then explore the airy parts
         of the level while suspended in midair behind the UPU. Details
         on how to achieve this amazing feat can be found on Theresa's
         Tombraiders.com and Harvey's Stupid Lara Tricks page.