The starting area is filled with Lurkers, Pukers, and Slashers. You'll want to be ready for them, as they will come in waves. The Lurkers will tend to stay on the ceiling, so be sure to aim up to nail them.
Continue on and you'll spot a passage blocked by trip mines. Detonate these to gain access to the flamethrower ammo schematic. Move back down the hall and take out the Cysts and Guardians that wait on the walls. There are some fire and stasis canisters you can use if your own charges are low.
You'll come to a Bench and save point, along with with a broke machine. Locate the various disk pieces and place them into the machine. You'll get jumped by a few Slashers, so take them down before they can reach you. You'll meet back up with Ellie and Stross before heading to your next objective.
The next room is filled with Exploders and Stalkers, and a Guardian at the end. Be very careful and take out every enemy one at a time. You can't afford to be swarmed, as everything enemy can do some gnarly damage. Stasis will be your best tool for taking down so many foes. After the room is cleared, be sure to pick up the nearby Power Node and restock on items.
The next hall has a few Cysts inside. Kill them before moving down further. In the next area throw explosive canisters at the fuel tank and then ride the elevator down for another tense encounter.
Throw more explosives at the fuel tanks and soon you'll be ambushed by Tripods. Slow each of them down and rip through them. Continue tossing canisters until the whole area starts to come down. Flee back to the tram where Ellie and Stross are to finish the chapter.