Weird Sentinal on the maw
On the maw right when you start go to the second life boat dock just like the one you came in on (this is alot easier on co-operitave mode) jump out and have your friend stay there and wait for you to respwan and keep on doing this after the fifth time one of you shoot up while jumping and the wait after your buddy respawns and in the life boat pod dock that you came in on will be closed up sentinals after a while they will open and most likely kill you because there is at least twenty of them.
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