I DONT TAKE ANY CREDIT and Im not sure if this works, TRY IT:
Step number one: You must get EXACTLY the right amount of power when shooting the orb. This will be indicated when the man says something like "you have got the right amount of power" or something similar. You can't have too much.

Step number two: You INSTANTLY have to run to the location I'm about to describe. In the starting room, open the door upstairs and turn right. Walk forward about 4 metres, look up to the generator on the wall. Everyone has to stand still here.

Step number three: You must WAIT until the map goes "black and white". I will explain the reason for this after these steps.

Step number four: As soon as it goes black and white all four people have to SHOOT the generator until your DeathMachine runs out (70 odd seconds later).

Step number five: THROW exactly three Gerche Devices directly under the Generator (on the ground) directly one after the another (for this to work two people need Gerche Devices [4 all together including for the orb]).

After this, the generator will be sucked into the black hole and a new sequence is activated. I don't want to ruin it for everyone, so I'll let you do it first and then let YOU report back. I'll explain what's happening for the Death Machine sequence.

You get the DeathMachines for a very specific reason. The (long-awaited) reason is that you have to loosen the generator. I assume that it is bolted on very well to the wall, so by shooting it for 70 seconds with the DeathMachines, you loosen it. And why do you loosen it? So that when you throw the Gerche Devices, it falls of the wall easier. The reason you use three Gerche Devices is that the gravitational pull of just one won't be enough to bring it down to the black hole, but the gravitational pull of three will be enough. Also, the map goes black and white to indicate you need to shoot the final working generator (and it resets the power, because the scientist has just escaped).

again i dont take credit, i found this after looking for it on google, dont flame if possible.
Let me know if it does/doesn't work!

EDIT: If anyone can livestream it comment so that everyone can watch since i cant play cuz of the super bowl

EDIT: The guy named temtam confirmed it, look in the comments, and ask him for a vid or livestream. Don't complain to me i simply wanted to put the idea out there.

EDIT: tried it and didnt work. this could be because the gersch devices were not thrown directly under the generator.feel free to try it again if you want