Typically most people do submerge the sub when faced with this attack. I guess if I am wrong you get to ask for a re-roll.
If my sub hits then disregard the roll for the CV
Sz52: SS(Sz45), CC+Ftr(Sz50),Ftr+Bmr(Jpn) Vs SS, CV, Ftr
Rolls: 1@2 2@3 1@4; Total Hits: 21@2: (1)2@3: (4, 4)1@4: (3)
Rolls: 1@2 1@4; Total Hits: 01@2: (6)1@4: (5)
Chi: 2 Inf+Ftr(Man), 3 Inf(Kwa), Inf+Ftr(FIC), 2 Ftr(Sz37),
Rolls: 6@1 4@3; Total Hits: 26@1: (4, 6, 5, 5, 6, 4)4@3: (2, 5, 5, 1)
Rolls: 2@2 2@4; Total Hits: 32@2: (1, 3)2@4: (1, 3)