(1) Aggressive solution: Reaching the main square Deus Ex: HR Guide
Last update: 11 May 2016
Leave the warehouse where you've started the game and start eliminating two guards here #1. It would be best to do that before they split up. Move quickly to the north #2, because your fight probably alarmed the remaining guards.
Map legend: 1 - Stairs leading to the main square; 2 - Defensive turret; 3 - Security building; 4 - Jam device; 5 - Bio-Mech Lab; 6 - Micro-Gen Lab.
Make sure you're behind a cover, preferably in such place from which you can see the stairs and opponents emerging there (screen above). Do not let enemies to get close to you and eliminate any attempts of their attack from a flank. Also watch out for guards called Sneakers, because they can use a camouflage, so their elimination is more difficult (a perfect way to see them is to use the Wall-Penetrating Imager augmentation).
Now move towards main, north-western square. Do not lean out too much or move to the north. Additionally pick up a good weapon, because the square is patrolled by two, heavily armed enemies with heavy guns (screen above).
Make sure that you eliminated all enemies in this area. After that, move north. There is a defensive turret north of here and in order to destroy it you could use EMP grenade (screen above).
Note! A description of further actions can be found in the description of Step 2 (Disabling the signal jammer).