Submarine SAMs, exposure and escape

Is IDAS the only submarine-launched surface-to-air missile in development, and are such weapons likely to be adopted?

Other work is mentioned, but targeting and exposure create difficulties, while remaining concealed may offer a better chance of escape.

IDAS is not treated as the only submarine SAM effort, though no other programme is clearly named. Targeting is difficult and launch may require an exposed depth. The intended use is to attack a tracking helicopter and buy escape time. Sonobuoys may still detect that escape, while uncrewed dipping-sonar assets accompanying a helicopter leave multiple threats. Torpedoes could arrive despite the missile launch. Concealment is presented as a better prospect for many submarines, particularly diesel-electric boats approaching the surface to recharge. Expected Baltic use is also connected to contested airspace.