Shield Belt, Ammo

Shoot the panel and find the shield belt with some ammo for your flak-cannon.
Ammo, health and invisibility

(near minigun and usefull bodyarmour)
Jump on closest pilar, turn your
back to the alcove, press jump and
immediately after that fire your
impacthammer (full force).
This will cause a little damage, but
there is enough health up there to
compensate (4 tubes).
(or use translocator)
Damage Amplifier

Jump on pilar on the right.
From there jump on box.
Other (easier) methods:
use hammerjump or translocator.