Anti submarine warfare is already a huge discipline. Submarines are still not obsolete, nor is it trivial for them to sink an entire carrier group. IIRC in exer

Anti submarine warfare is already a huge discipline. Submarines are still not obsolete, nor is it trivial for them to sink an entire carrier group. IIRC in exercises a submarine usually gets one shot before it has to run from the ASW attacks. For any technological advance, the counter technology adapts, so it's not very common for something to actually become obsolete.