Did ya notice that it was a suicide mission? No scene showing the troops escaping................mikan

Spoiler Alert!!!!!!






....................................it takes multiple hits on the eye probably 30 or 40 shots to finish it.........................mikan

I've went thru the mothership. Cover every inch. Now at a throbbing thing with an eye. What do I have to do to reach the end of the game. I've tried shooting and lobbing grenades at the eye thingie but nothing happens. Please help me.........thanks a bunch