It is a possibility that they all "drowned". It could also be the they drifted much faster, due to the winds. I have had similar happen, though I got two out of a bunch one night, but I don't think I had 15 knot winds. Yikes! Did not get a completed mission. If you go to decks awash and ahead 1/3, you can use sonar to help in finding them also. It looks like you had the mission that specifically mentions being off Guadalcanal by the 9th of October? or you might have had the general "Solomons" for the 5th of December? The pilots will be surrounded by a bright pink "halo" about them, to mark them visually for you, which under normal circumstances can be seen a long way off, but typhoon weather? sheesh, who knows?
I put some Japanese pilots in the water in a few of those missions, hoping to be able to "rescue" some of them to be used for their intel, however, the game doesn't do that...
