. Unlike panzer IV , which had a seperate port ,, the 34's was welded to the turret , the internal stuff moved , not the outside . And if the tank blew up , the blast would blow open the roof/ Driver hatch and / or remove the turret . Never seen blow out turret vision ports on T-34
Notice glancing blow on vision port , pretty good welding
picture from Squadron / Signal T-34 in Action