yeah, just last week i accidentally clicked on "new career" instead of "saved" and it deleted my entire career.
i was on patrol 10 in a type 2, late 1940.
i then found out that starting a career other than the start of the war in a type 2 is "impossible" (requires modding that i'm unwilling to do when i can just restart a career...)
so now i'm on patrol 2 again, with my rookie crew
so! right there with ya, buddy!