First, if u start at the beach and go up into the wall using the stairs w/ the smg, u will see a kind of bumpy ramp. Go up it. There will be three or four arches at the top. The one on the far left (facing the base) is the one u want. jump into it. Now turn to the left till u see a ledge above an archway. u should seea funny lookin gold thing on top. Just jump over to it and pick up... the gravity rifle(may take a couple go's to get there). The grav rifle is one of the better known "secrets". i t doesn't do much damage, if any at all. Use it to jump super high. Go to a place thats directly under the "top" of the level. it cant be too high up. Charge up the rifle(press and hold), point it at the ground, and jump just before u fire. u want take any damage, and u jump HIGH. also, when fully charge, the rifle is exellent for supressing vehicles.
For the next secret, u NEED the grav rifle. I think this one might be less known. k, get the rifle and get back on the wall. go to the area where the row of frag grenads and the sniper is. Jump into the broken scetion of wall and go as far left as u can (left if u r facing the base). once up against the side of the wall, charge up the rifle to full, jump and fire. u will end up at the top part. go over to the end, the cirular area, and look on the ground. u should see a semi-round thing w/ red and green markings on it. go over and it will say "press e to pick up plasma rifle". obviously, this isn't a plasma rifle. i havn'e been able to use on anything or body yet. it seems to be a spray can, and i think, if u have decals "on" in yur settings, it will paint stuff on walls.
The last thing is the dual SMGs. This one is also probly well known, but i bring it cause it in kind of a hidden place. Starting on the beach, by the weapons and vehicles (thats where u usallay start right?), facing the toward the base, head right. Keep going till u come to an area where u see a long rock sticking out of the ground. it should have a kind of dip in it toward the middle. jump over and find the SMG's. ~note~ u cant use gernades w/ the dual smg's. the gernade throwing trigger/ key is now used to fire the second smg. so basically, u use both mouse buttons to fire both guns.
other notes- u dont lose the dual smg's when u get in a vehicle or change weapons!
That is the only place to find them, and u cant get ammo from regualr smg, so u have to go back if u need more
i think that while u have the grav rifle, u dont take fall damage. that or the level just doesnt have fall damage.
So have fun, i thought the stuff would be intresting.
-Silent Unknown