Protecting the Future

M17: Protecting the Future is the 17th main mission in Deus Ex: Mankind Divided, and one of the last missions (depending if you did M16: Stopping Marchenko first). Adam Jensen must save Nathaniel Brown and the UN delegates if he wants to stop the Illuminati conspirators' plans, but at the cost of hundreds of others' lives.

Find and Protect the Delegates
If you did the The Heist and got the Orchid cure, you can use it right after the cutscene to save Jim Miller (and get the He's [Not] Dead, Jim achievement) or, if you don’t think you’ll make it to the delegates in time, save it for them. However, if you move quickly enough and do this one before dealing with Viktor Marchenko, you can stop the delegates from taking a sip and therefore save them without needing the antidote.

Despite what Marchenko says, he won’t detonate right away. If you didn’t set off any alarms, you’ll have 10 minutes to save the delegates and stop Marchenko before he sets off the bombs. If you do both successfully, you’ll earn the Spokes in Two Wheels achievement. Having a lot of biocells, Icarus Landing, and maxed out glass-shield cloaking and cybernetic legs will greatly help to get the achievement.

The easiest way is to make your way to the elevator that’ll go to the conference rooms. Of course, the path is covered with guards and turrets. You can either ghost by them (remember to use the leg silencers if you walk/run) or use the vents to get close enough. The key thing is to move quickly as you can. Do NOT call the elevator to the floor if you’re trying to ghost as it’ll attract the nearby guards’ attention. Instead, go through the nearby door with your keycard and fall down to the elevator below. If you gave Alex the evidence from M7: The Rucker Extraction, she’ll contact you here to give you a code. Take the elevator to the VIP rooms and run to the door at the end to save the delegates. You’ll have to hack or use a multi-tool if you didn’t get the code. Once in, a cutscene plays out and, if you were quick enough, Adam will stop the delegates from taking a sip. Otherwise, if you have the cure, you can save them with that. If you were too slow, they’ll be dead.

If you did this one before dealing with Marchenko, run back to the elevator but do NOT take to the other floor, where the guards are if you want to remain undetected. Instead, jump up through the hatch and go back to the door you came through originally to jump down the elevator shaft. If you were quick enough, this is when Marchenko will contact you about how you’re taking awhile to get to him. Now it's time to face him one last time.

If you did this mission last, then it'll cut to the ending and you can see how your choices play out in your conversation with Alex and on the news.