While the force was in the Strait of Bonifacio, Dornier Do 217s of the German Luftwaffe's specialist wing KG 100—armed with Fritz X radio-controlled bombs—sighted the force. The first attack failed, but the second dealt Italia (ex-Littorio) and Roma much damage. The hit on Roma caused water to flood two boiler rooms and the after engine room, leaving the ship to limp along with two propellers, reduced power, and arc-induced fires in the stern of the ship. Shortly thereafter, another bomb slammed into the ship and detonated within the forward engine room, causing catastrophic flooding and the explosion of the #2 main turret's magazines, throwing the turret itself into the sea. Sinking by the bow and listing to starboard, Roma capsized and broke in two, carrying 1,393 men—including Bergamini—down with her.
https://en.wikipedia.org/wiki/Italian_b ... Roma_(1940)
A radio-controlled Fritz X PGM gravity bomb had been released at a safe distance by a high-flying German warplane and it exploded 49 ft (15 m) distance from Philadelphia. Savannah increased her speed to 20 kn (23 mph, 37 km/h) as a KG 100 Dornier Do 217 K-2 bomber approached from out of the sun. The USAAF's P-38 Lightnings and Savannah's anti-aircraft gunners, tracking this warplane at 18,700 ft (5,700 m), failed to stop the Fritz X bomb, trailing a stream of smoke. The bomb pierced the armored turret roof of Savannah's No. 3 gun turret, passed through three decks into the lower ammunition-handling room, where it exploded, blowing a hole in her keel and tearing a seam in the cruiser's port side. For at least 30 minutes, secondary explosions in the turret and its ammunition supply rooms hampered firefighting efforts.[4]
Savannah's crew quickly sealed off flooded and burned compartments, and corrected her list. With assistance from the salvage tugs Hopi and Moreno, Savannah got underway under her own steam by 1757 hours and steamed for Malta.[4]
Savannah lost 197 crewmen in this German counterattack. Fifteen other sailors were seriously wounded, and four more were trapped in a watertight compartment for 60 hours. These four sailors were not rescued until Savannah had already arrived at Grand Harbor, Valletta, Malta on 12 September.[4]
https://en.wikipedia.org/wiki/USS_Savannah_(CL-42)