Torpedo net
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Torpedo nets were a passive ship defensive device against torpedoes. They were in common use from the 1890s until the Second World War. They were superseded by the anti-torpedo bulge and torpedo belts.
An example of torpedo netting at the Scapa Flow museum, Orkney
HMS Hotspur deploying torpedo nets
Stowing torpedo nets on SMS Weissenburg in 1896.
Russian battleship Evstafi with torpedo nets deployed
Anti-torpedo bulge
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The anti-torpedo bulge is a form of defence against naval torpedoes occasionally employed in warship construction in the period between the First and Second World Wars. It involved fitting partially water-filled compartmentalized sponsons on either side of a ship's hull, intended to detonate torpedoes, absorb their explosions, and contain flooding to damaged areas within the bulges.
HMS Glatton in drydock, circa 1914–1918, showing her anti-torpedo bulge
USS Texas with its starboard torpedo blister removed during ongoing repair work, showing the original hull underneath.