The Long Way Home

M4 - The long way home is the final mission in  Deus Ex: Human Revolution - The Missing Link DLC.

Visit Quinn's shop to get supplies (optional)
If Adam managed to save both the prisoners and Dr. Kavanagh, Quinn will applaud him enthusiastically and reveal that he left some supplies in his shop in the Maintenance Area before escaping Rifleman Bank Station to help against Pieter Burke in the upcoming confrontation.

Getting there can be difficult due to heavily increased security forces and bots and some corridors being covered with frag mines.

Recommeded route is through vent system.

Once in Quinn's shop you may want to move some boxes in the backroom revealing a hidden switch. It will open a Quinn's Secret Store (Achievement), with some guns and upgrades, as well is lvl 5 Locked Computer. Hacking it will reveal that Quinns is not what is seems to be. If you used the Trauma Kit on the Hyron drone in the Seafloor Laboratories, the top lvl 5 Locked Safe in Quinn's shop will be opened. Otherwise, it will need to be hacked to obtain the contents.

Fulfulling this objective will net 2400 XP.

Confront Burke
Burke is hiding inside a control room in Loading Bay 3. To reach it, Adam will have to traverse well-guarded Loading Bay 1 and 2.

Get into Loading Bay 2
There is a shortcut however, by hacking the door to Loading Bay 2 (Level 5) and sneaking to the left corner to the corridor leading to Loading Bay 3.

Another option is to get on the top level of Loading Bay 1 machine (there is a sniper position there), to do this you must pick up some boxes stored in the SW corner of the room. Beware of EMP mine and look for Pocket Secretary with turret codes under boxes. If you throw boxes on top of the nearby container (you may need to wait for soldiers to calm down after all the nose, and from there you can throw them on top of the control room. Once all is qiuet, you just have to climb the ladder, stack the boxes, and jump over to the rails. It is fairly easy to do a take down on sniper (if you are playing for Factory Zero Achivement) and get a praxis kit and some ammo (if not) . From rails you can get to shaft leading to Bay 2.

Get through Loading Bay 2
The exit you nex is SE corner of the room, if you sneaked htrough Lvl 5 Door or a top vent shaft, it is rather easy to sneak past turret to the coridor.

You can also reprogramm turrets to do killing for you, PA with code is located in control room.

Defeat Burke and his men
Burke is guarded by a heavy and some medium guards, two snipers and a 80-X Boxguard. Burke himself is quite easy to take down, either lethally or non-lethal, i.e. by throwing a single gas grenade into his control room (on the Give me a Challenge difficulty).

Go to Loading Bay 2's docking platform
Adam just has to head back to the Zhen Zhu's cargo ramp just outside of Loading Bay 2 to find Garvin Quinn waiting for him. After a short conversationin which Quinn discloses himself to be the mysterious voice from the previous missions. He also admits to having utilized Keitner and Adam Jensen for his and his anonymous employer's causes before sending Jensen to another Belltower secret facility in another stasis pod aboard another cargo ship. The ending sequence shows a freight helicopter carrying the container with Adam's stasis pod to the ship.