 Four underwater 17.7-inch (450 mm) torpedo tubes were also fitted, two on each broadside in a compartment immediately abaft the forward magazine. Imperatritsa Mariya's trials revealed problems with her magazine cooling systems where the heat generated by the ventilation system mostly negated the cooling effects of the refrigeration system. Her sisters shared this problem, which may have contributed to the magazine fire suffered by Imperatritsa Mariya that led to her loss in 1916.
