Editing Depth charge (section)

==Later developments==
For the reasons expressed above, the depth charge was generally replaced as an anti-submarine weapon. Initially, this was by ahead-throwing weapons such as the British-developed [[Hedgehog (weapon)|Hedgehog]] and later [[Squid (weapon)|Squid]] mortars. These weapons threw a pattern of warheads ahead of the attacking vessel to bracket a submerged contact. The Hedgehog was contact fuzed, while the Squid fired a pattern of three large, {{cvt|200|kg|lb|order=flip}} depth charges with clockwork detonators. Later developments included the [[Mark 24 Mine|Mark 24 "Fido"]] acoustic homing torpedo (and later such weapons), and the [[SUBROC]], which was armed with a nuclear depth charge. The [[Soviet Union|USSR]], United States and United Kingdom developed [[nuclear depth bomb]]s. {{ As of | 2018 }}, the [[Royal Navy]] retains a depth charge labelled as Mk11 Mod 3, which can be deployed from its [[AgustaWestland AW159 Wildcat|AgustaWestland Wildcat]] and [[AgustaWestland AW101|Merlin HM.2 helicopters]].<ref>{{cite news|title=815 NAVAL AIR SQUADRON|publisher=Fleet Air Arm Association |url=https://www.fleetairarmoa.org/Content/sites/FAAOA/pages/178/20081118-cjj-final-815history.PDF|access-date=21 June 2018|date=21 June 2018}}</ref><ref>{{citation |author=Ministry of Defence |title=Written answer 4.5.2.5 (Type 26 Frigate) to Defence Select Committee |publisher=parliament.uk|date=9 October 2014 |url=https://www.parliament.uk/documents/commons-committees/defence/141009_SoS_re_Type_26_Global_Combat_Ship.pdf|access-date=21 June 2018}}</ref>

Russia has also developed homing (but unpropelled) depth charges including the [[S3V Zagon]] and the [[RBU-6000|90SG]].<ref name=roe-rpk>{{cite web |title=Anti-submarine rocket launcher system RPK-8 {{!}} |url=http://roe.ru/eng/catalog/naval-systems/shipborne-weapons/rpk-8/ |website=Catalog Rosoboronexport roe.ru}}</ref> China has also produced such weapons.<ref>{{cite web |title=PLANAF conducts live-fire exercise with new guided depth charge |url=https://www.janes.com/defence-news/news-detail/planaf-conducts-live-fire-exercise-with-new-guided-depth-charge |website=Janes.com |date=December 8, 2020|language=en}}</ref>

===Signaling===
During the [[Cold War]] when it was necessary to inform submarines of the other side that they had been detected but without actually launching an attack, low-power "signalling depth charges" (also called "practice depth charges") were sometimes used, powerful enough to be detected when no other means of communication was possible, but not destructive.<ref>{{cite book |url=https://books.google.com/books?id=S0D_CAAAQBAJ&pg=PA43 |title=Leadership: Limits and Possibilities |first=Keith |last=Grint |page=43 |isbn=9781137070586 |date=2005-01-20 |publisher=Macmillan Education UK }}{{Dead link|date=January 2024 |bot=InternetArchiveBot |fix-attempted=yes }}</ref>