Could anything in the hypothetical Alaska battle group deal with Japanese spotting submarines?
Short answerThe Gearings could, and the Crown Colony cruisers are also credited with ASDIC and depth charges.
NotesThe four Gearings supply the immediate answer to the submarine threat. The Crown Colony cruisers are also credited with ASDIC and depth charges. British concern about cruiser antisubmarine protection is linked to the losses of Aboukir, Cressy, and Hogue. The explanation treats that earlier experience as a reason for retaining antisubmarine weapons on later cruisers.