YOU SCRATCH MY BACK, I'LL SCRATCH YOURS.
Chapter 13 - Fallen Soldiers.
Determined to locate Sarif's scientists, Jensen tracked down Isaias Sandoval, personal assistant to America's most outspoken augmentation opponent. Sandoval admitted to operating on the scientists in hopes of disabling their implanted tracking devices, but refused to implicated his boss, Bill Taggart. Pritchard then traced one of the scientists' signals back to China, sending Jensen and Malik scrambling to find him. Unfortunately, the conspirators are still one step ahead...
MEET THE HARVESTER CONTACT.
Meet one of Tong's Harvester thugs in the sewers below the Alice Garden pods.
RESCUE TONG'S SON.
Infiltrate the abandoned noodle factory and rescue Tong Jr. from Belltower Associates. Give him the Harvester contraption.
MEET TONG IN THE HARVESTER HIDEOUT.
Complete the mission and receive Grenade launcher.
info taken from deusex.wikia