View the photos from a dramatic draw for the Blues
Pompey let a three-goal lead slip as they were forced to settle for a 3-3 draw at Southend.
Bryn Morris fired them into an early lead, while Ben Close then volleyed in another on his 100th appearance for the club.
And they completed a fine comeback in the second half, with Cox slotting in a penalty and then claiming the matchball with a late leveller.