Head forward and wipe out the guards, then head inside and take on the ninja bots down below. Before going on however, go punch the lower left wall to find:
HIDDEN CHEST #53:
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After beating up the ninja bots at the start of the level, go punch the lower left wall in the area they were in to find this secret room.
Continue on. Up ahead it looks like a lone guard but the shutter on the right will open with a gattling robot and two ninja bots, so be ready for them and a sudden attack. Head forward into the elevator after that. Continue on and be ready for a robot to bust out of the box to the north. Past that in the next big room a gattling robot will bust out of the upper left with another robot from the north (take out the gattling robot first). To the left you can find a room with some extra relics.
Jump up the boxes and take out the enemies up there (you can Blast the guard before he gets in the robot if you wanted to). Head north to see a scene. Head down now and destroy the robots, then head right and down to take on two more robots (one busts out of the northern crate: take out the right one first). In this room check the upper left hand corner for some relics and continue on.
Continue on and up to the next fighting area. Use a Blast here if you can to take out the two gattling robots and the other one that shows up. Now, before continuing on check the upper right wall (in front of the crate) for:
HIDDEN CHEST #54:
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In the room with the two gattling gun robots (and the one robot that breaks out of a crate on the left), defeat the robots then check the right wall (in front of the crate) to find this secret room and chest.
Continue on for a scene. Just a little further now: head forward and beat up the two guard bots then continue on and watch out for some missile guards and club bots. Keep pressing forward and you'll soon see a final scene ending this chapter and starting the next one (quite a few scenes actually: a lot of story is being wrapped up!).