a dying a step by step walkthrough of blast pit (black mesa, chapter 6), played through steam, on the hard difficulty setting, with maximum graphical detail. in the rocket silo, he finds a large tentacle like alien obstructing the path to the surface. Gordon enters a largely abandoned cold war rocket test facility. Half Life (100%) Walkthrough (chapter 6: Blast Pit) use the lever to activate the lift below. move forward and watch out for the bullsquid spit. Blast pit half life walkthrough half life 175. knock it out with the crowbar and float in. break the planks at the top and float over to the breakable duct. when the fan is on, jump into the void to reach the ceiling. the wind blown from the fan will push you up to the top of the room that's one powerful fan. When the fan at maximum power, jump out into the void. A step by step walkthrough of blast pit (black mesa, chapter 6), played through steam, on the hard difficulty setting, with maximum graphical detail. In half life chapter 6: 'blast pit', gordon freeman enters a missile silo where tentacles are killing black mesa security guards.