Once you find Bashar under the Grand Central rail next to the Town Hall of Rookwood. Go up to him and speak to him to obtain your first quest
The second quest Bashar sends you on is to head to the Volkov Tunnel next to Bad Bunni in Rookwood.
Bashar gives you 20 tnt and 1 lever. Place all 20 tnt in the volkov factory and use the lever to ignite the tnt and blow it up.
Once done return to Bashar to complete the quest.