Secret computers end of mission 4

Games Other Halo
1

Found some intresting computers on the 4th mission, legendary, after taking out everyone, one computer says sublevel offline, one computer sais sorry we are having troubles processing due to high volumes of, one computer sais sublevel maintance access not available, and the last sais, mark 10 prototype offline, any ideas what im seeing

Do they unlock something

2

Just to be clear its in the part where you get the mantis, what i did was, used the mantis to open the door, jumpout out killed everyone in the city section, and explored the catwalks, 2 computers in room one (room after you open first door, and 2 computer in last room (Not glowing, kinda hidden)

3

Bump for any help