Definitely. Operation Mincemeat actually happened. It involved elaborate planning and had a significant impact on the war. The details of the operation have been well-documented and studied.
No, it's not. From what I know, it's just a made-up story. Maybe it takes some inspiration from real events, but it's not a direct account of something that actually happened.
In most cases, Operation Seawolf is not based on real events. It could be inspired by various fictional elements or imaginative concepts rather than actual happenings.