Once you locate the node-locked door, you will be near a quick time event (QTE) where failing means death. Schematic - Advance Suit plans in the node-locked room. It will save you a lot of ammunition though.

Use their seeds if you manage to capture one, but that's not always an issue. Hack the door and head into the wrecked mining tunnel. Any way you do it, head through the door. Work your way down - you may have a safer spot to attack enemies from the dead-end rooms at the bottom than the top. Stake them (the stakes are at the bottom of the ramp), or use Detonator mines and stasis/plasma. The ramp room features babies, stalkers, and Slashers. Considering Large Medkits cost 10,000 credits, this exploit costs considerably less. Your life will now reflect your new HP maximum. Re-enter the workbench a second time and re-weld all the nodes you had before. The trick is to upgrade your RIG twice: after re-speccing your RIG, you weld one node to the first HP spot and exit the workbench (you can also weld no nodes and exit). You can use the Re-Spec exploit to refill your life if you are so inclined. A workbench is here next to the save station.

Dead space 2 chapter 15 store