The and s use photonics masts rather than hull-penetrating optical periscopes. The collision resulted in damage to the submarine's periscopes and conning tower. The submarines have two Kollmorgen periscopes. The gunner was given a telescoping gun sight and two observation periscopes. These GFM cloches were sometimes used to emplace machine guns or observation periscopes. Aiming was by periscopes located on the turret and cupola. She repeatedly fired on suspected submarine periscopes. The gunner has two vision periscopes that cover the front and left of the turret. Final production BRDM-2s have additional turret periscopes and a TNA-2 navigation apparatus. Both the loader and gunner are also provided with periscopes. The vehicle has three forward-facing periscopes in front of the driver's cupola. The periscopes and radar were knocked out. The commander has the latest iteration of the TOP 7 cupola with eight non-reflecting periscopes. The driver had two periscopes and a visor in the hull front. The hatch cover is fitted with three integral periscopes for driving when it is closed.