Blast Pit

Blast Pit is in Half-Life 1. It's right after "We've Got Hostiles."

Walkthrough
Things are just about to heat up so stay alert. Use the crowbar to break away the blockade and kill the Bullsquid. Head into the room and go for the control booth, flip the switch to call the elevator. Now climb down to the elevator and ride it down to the bottom. Once at the bottom hop on the cart. The cart is turned on using the "USE" key and its speed it controlled by the "FORWARDS" and "BACKWARDS" keys. Along the track the carts follows is a lot of Bullsquids, Houndeyes, and Headcrabs. You can go slow and kill them all or just fly ahead at top speed and avoid them. Towards the end of the track you can set the carts speed to full if you want to jump across the radioactive waste and land on a box, then keep jumping from box to box to get to the other side. But what I found easier (and healthier) was to jump off just before the cart hit end, then climb back on and jump onto the little rails on the side and from there jump onto the bit of cement running along the side of radioactive waste pool. Then walk around and under the pipes to get to the ladder on the other side. Climb the ladder to get onto the pipe then go and drop into the opening in the pipe just ahead.

Follow the pipe and jump out and the end, then jump up to the pipe running close to the top of the room and follow it. You can get on it from the balcony by jumping from there to the pipe. You should come to another room filled with toxic waste. Jump onto the next pipe and make your way to the elevator. When you enter the room there are some First Aid kits and some HEV power to your left. To get there jump to the silo base and follow it over to the ledge. Go get in the elevator and ride it to the top. At the top are some Houndeyes, Headcrabs and a Bullsquid. Be wary when shooting at them for if the barrels explode they take the bridge with them and it is a long jump to make. Once across enter the silo.

Things are getting worse all the time. A gigantic three Tentacled monster has moved into the silo. It needs to be destroyed, but your weapons are no match for it. Luckily it is located in test fire area for an experimental weapon. But you need to turn on the Fuel and Oxygen, and Power. The Tentacle will attack and kill the Scientist so once the Tentacle gets out of the way leave the control room. Before climbing the ladder you should kill the Barnacle. At the top of the ladder is a Security Guard who tells you the monsters weakness, it is blind and relies on sound to hunt. So leave the Guard here for now. When you enter the adjacent room another Security Guard is here and he does a rather foolish thing. Now who's gonna clean up the mess he made? Crawling puts you in stealth mode but so does walking ( holding down the speed adjust button while moving). Grab the Grenades you will need them later on. Walk to the ladder and if the Tentacle gets to close throw a Grenade in a direction away from you so that once it explodes it grabs the Tentacles attention allowing you to proceed. Try and blow up the crates blocking up the ladder and try and blow up the boarded door. You need to get to the second level and through the doorway there.

Once at the doorway exit the silo and kill the Zombie, if the bridge explodes then you can jump onto the thin pipe and walk across the gap. Follow the hall and you will come to a T-Section, to your left is the Fuel and Water room door but it is locked, so we need to find another way in. Go right and there is a ladder, before venturing down the ladder drop a Grenade down to kill the two Zombies that are lurking in the shadows. Climb down and break the grate with the crowbar. Climb down to the pipes below, follow them until the intersection and then take a left. You should arrive at a ladder, climb up. Break the grate at the top of the ladder and kill the Zombie. Now head down the hall and open the door, dispose of the two Zombies that lurk here. Now climb down the ladders to the fan switch. You need to switch on the fan to continue so once there flip the switch, it is important that you move fast once the switch has been flipped. You need to get up the ladder as quickly as possible or it becomes impossible to get back up. Once at the top look up at the boarded up ceiling, you need to get up there. Once the fan is at full power jump into the air stream and you will be pushed up to the ceiling.

Once up there break the grate and climb in and be prepared to kill a few Headcrabs that jump out at you. Crawl through the duct and you will come to a ladder. Climb down and kill the couple of Zombies in the Fuel and Oxygen room. Once they are dead press the button marked "FUEL" and "OXYGEN". Right that is the Fuel and Oxygen taken care of, now for the Power. exit the control room and head back to where the Tentacle is, we now need to get to the bottom level of the pit and go in through the doorway there. Again use Grenades to lure away the Tentacle. If you haven't already throw a grenade at the barricade blocking the doorway allowing you easy access. Follow the metal floor and jump the gap. Then quickly run for the door because something is about to crash straight through the metal floor that you just ran over. Open the door and proceed through. The door will lead to another bridge with explosive barrels on it. Try and kill the Bullsquid from where you are instead of crossing the bridge to get him. Once he is dead cross the bridge and in the case that the bridge gets blown up you can again walk on the thin pipe to get across.

Follow the hallway and through the puddle (that puddle gets its own back latter). You will come to an open room with a Bullsquid and quite a few Barnacles hanging on the roof. Kill the Bullsquid and if you wish you can shoot the Barnacles. Call the elevator. You can either ride the elevator down, though it stops half-way down and you must jump onto the metal ladder running down the side of the shaft before it crashes down into the harmful waste. Or you can get up on the railing the runs along the jutting out bit of floor and jump onto the ladder from here. Once at the bottom you will see a Scientist and a panel monitoring the generator. It shows that it is currently off, and the Scientist will tell that the generator needs to be turned on. Now walk down the hallway and jump on the pipe to avoid the waste spill. Continue down the hallway and kill the Zombie that is here. You will find the generator just ahead. Walk onto the platform and press the button, it will move around to a ladder. Climb the ladder and watch out for the berserk platform that keeps whizzing around ( if you get in its way it kills you so be careful). Time getting down from the ladder so that the berserk platform doesn't get you, then run along the little ledge to either one of the ladders and climb up. Jump onto the generator and you will see a Scientist cowering on top of the generator. Press the button and an electrical cord comes and plugs into the generator. The is cord is lethal as well so get out of the way of it. Climb back down and once again time your descent so that you can run across to the next ladder without being killed. Climb up the next ladder and press the button here. Another cord come out and plugs into the generator. Now the generator is on move back to the platform that brought you here and go back to the monitoring panel. It now shows it is fully operational. There is a health dispenser by the Scientist if you need it. Climb back up the ladder to the back to the top.

When back in the hallway don't walk through the puddle. The puddle is now electrified because the power is on (see I told you it would get its own back). Go push the boxes from the room you came from into the puddle to form some stepping stones. Now climb onto one and make a running jump to clear the rest of the puddle. Head back to the Blast Pit. You need to get back to the control room from the start of the level. As usual walk or crawl and use Grenades to lure the Tentacle away. Once back at the control room press the button marked "TEST FIRE".

Get back down to where the Tentacle was and climb down the ladder into the hole it left. Follow the hole until it turns to a drop into water. Since it is quite high try and land in the water or you will probably break your neck. Swim back up to the ledge and search around with your flashlight. Grab the .357 ( The Magnum!) a gun with a lot of whoop ass power. Grab the ammo and drop back into the water. Swim under the pipes and you will emerge into an area full of toxic waste. Climb down the ladder if you need to use a health dispenser or HEV power dispenser. Climb back up and jump onto the pipe running along the room. Walk along until it hits the roof and you can't go any further then drop down onto the pipe next to it and follow that one. Follow it until you come to the big pipe, then climb on top of it and turn the valve. It will extend the pipe allowing you to jump across to the pipe opposite it. Crawl into the gap in the mesh and follow the pipe. Soon it will break under your weight and you will end up in a room full of crates. Break open the crates to find some laser trip mines. Head out into the hallway.