I believe that it stems from US Navy's experience against the then leased Gotland-class submarine. If it is a performing system, it would most likely counterbalance the quiet capabilities of a conventionally-propelled submarine versus an ASW task force or a carrier task force.
Please, read the article here.
Remember that ARA San Luis, a Type 209 submarine, really hampered UK's naval task forces during the Falkland Wars; when all Argentine naval units were ordered back to port after the General Belgrano's sinking, it remained the only one in active duty to face UK's carrier groups...
Please, read the article here.
Remember that ARA San Luis, a Type 209 submarine, really hampered UK's naval task forces during the Falkland Wars; when all Argentine naval units were ordered back to port after the General Belgrano's sinking, it remained the only one in active duty to face UK's carrier groups...