This is by far the most interesting cave mission on EDF 6. It could be done on Hardest without many issues and it was quite fun, but on Inferno it's a whole new ball game. There are a few constraints, problems, and changes and unless you have some knowledge of them it's extremely unlikely you'll succeed in the mission by just shooting around. This is a very long mission, 40 minutes to 1 hour is the norm with this strategy.