Possible:

Find Protection Suit

Find Exit Key

Access KGB HQ

Impossible:

Sabotage 4 Special
Crates
                     Recover NOC List: Warehouse

                  Follow the red dot on the Scanner to get the
                  protection suit. There are 5 special crates that you'll
                  have to destroy. They look different from the normal
                  boxes. Follow the red dot on your scanner to find an
                  enemy holding the key. Go to the white dot on your
                  scanner to find the exit.

                  Tips: Shoot the boxes from a distance, and jump over
                  the toxic pits. Find the protection suit ASAP. It is at a
                  different location on Impossible.