Roll a megabomb left, in front of the Mabu Rizzo, and blow up the barb wire.
Combat Hat - +15 Elemental Power
One of the treasure chests is located right next to the legendary treasure.
The last treasure chest is located in Tech Base Theta, to the left of the big boss. Blow up the top-left turret and it will reveal a way to access a ramp that has a jump pad, given you access to the chest.