Chile Miner Rescue

A Chilean miners have been under earth for two months and it seems that their air supply thins out, so you need to get them at surface promptly. You have only a limited time to construct a tube used to lift them. You must save thirty three innocent lives. On a line you see different parts coming and it is up to you to choose right ones. Often you get useless junk. Throw it away. Get to it, clock ticks.