Amazing that he was moving a convoy with no escorts. I will need to sink more ships to force him to stop doing that.
Also, even though I haven't seen any enemy sub attacks in the past few turns, that doesn't mean that they are not around. It seems that my aerial ASW is spotting a fair bit of activity. To see this (and to plot where the sightings are, I recommed that you check your combat events file (not the combat report) and operational events file each turn.
Here are the parats that show sub sightings during the turn.
OPERATIONAL REPORT FOR Jan 12, 42
SS RO-61 reports having been sighted by the enemy at 136 , 98
SS I-174 reports having been sighted by the enemy at 183 , 102
SS I-158 lays minefield at Tambelan Islands - 54 , 92 and sets course for Saigon
E13A1 Jake reports possible submarine at 122, 59 near Hakodate
E7K2 Alf reports shadow in water at 101, 55 near Masan
G4M1 Betty reports periscope at 106, 50 near Genzan
B5M1 Mabel reports submarine at 116, 52 near Hirosaki/Aomori
E13A1 Jake sighting report: 2 Allied ships at 125,49 near Bihoro, speed 17, Moving East
H6K4 Mavis reports conning tower at 121, 46 near Wakkanai
E8N2 Dave sighting report: 8 Allied ships at 117,55 near Akita, speed 16, Moving Northwest
E7K2 Alf reports periscope at 132, 115 near Kwajalein Island
Ki-36 Ida reports periscope at 81, 72 near Laoag
H6K4 Mavis reports conning tower at 123, 54 near Kushiro
H6K4 Mavis reports turbulence in water at 121, 46 near Wakkanai
H6K4 Mavis reports shadow in water at 121, 46 near Wakkanai
H6K4 Mavis reports periscope at 121, 46 near Wakkanai
G4M1 Betty reports radio transmissions at 111, 51 near Nakhodka
E8N2 Dave reports periscope at 116, 55 near Akita
F1M2 Pete sighting report: 1 Allied ship at 106,66 near Kanoya, speed 10, Moving Southeast
E14Y1 Glen reports conning tower at 164, 65 near Ulak Island
SC Ch 27 arrives at Tokyo
xAK Walter Luckenbach is reported to have been sunk near Christmas Island on Jan 12, 1942
xAK Fatshan is reported to have been sunk near Culion on Dec 17, 1941
SC Ch 33 arrives at Tokyo
COMBAT EVENTS FOR 01/12/42
E13A1 Jake reports possible submarine at 122, 59 near Hakodate
E7K2 Alf reports shadow in water at 101, 55 near Masan
G4M1 Betty reports periscope at 106, 50 near Genzan
B5M1 Mabel reports submarine at 116, 52 near Hirosaki/Aomori
E13A1 Jake sighting report: 2 Allied ships at 125,49 near Bihoro, speed 17, Moving East
Ki-36 Ida sighting report: Allied SS at 81,72 near Laoag , Speed unknown
TF 86 sighted by Allied Float Plane at 110,46 near Rashin
TF 5 observes Allied Aircraft at 71,90 near Tawi Tawi
H6K4 Mavis reports conning tower at 123, 54 near Kushiro
G4M1 Betty reports radio transmissions at 111, 51 near Nakhodka
E8N2 Dave reports periscope at 116, 55 near Akita
F1M2 Pete sighting report: 1 Allied ship at 106,66 near Kanoya, speed 10, Moving Southeast
E13A1 Jake sighting report: Allied CM at 64,97 near Balikpapan , Speed unknown
E14Y1 Glen reports conning tower at 164, 65 near Ulak Island
TF 11 sights Allied Float Plane at 68,80 near Balabac
SS I-158 lays minefield at Tambelan Islands - 54 , 92 and sets course for Saigon
Another thing that a smart Japanese player will do is to train up your bomber crews on ASW early. In general, my rule is that any bomber unit that is not doing anything needs to be training on 70% ASW. This especially includes Idas, Marys, Sallies, Anns, and Lilies. That way, you will develop the airborne ASW force that you need by the summer of 42. Often the squadrons already know how to search, bomb, or torpedo if applicable but in pretty much all cases their ASW skill will be very low. Furthermore, you can't just put them on ASW patrol and hope to gain the experience because they only get a point when they sight something. That is a very infrequent occurrence when the crew's skill levels are in the teens.
Here is the ships sunk summary confirming the killing of the AK:
