Complete Zadornov Search 6. Mother Base must have been upgraded to 2 plants. When your Intel Team reaches Lv. 40, development on the second plant will begin. At that point, complete 13 Extra Ops missions other than Target Practice: No Limit or training missions to complete construction. You must have gathered all the basic parts for Metal Gear ZEKE, and must have the railgun installed. Metal Gear ZEKE cannot be assigned to an Outer Ops Team. After fulfilling the requirements above, complete 3 additional Extra Ops missions (other than Target Practice: No Limit) to trigger the call from Kaz informing you that Zadornov has escaped his cell again.
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