First point, you should have seen at least one third of these:
and the patrols should have been attempting to rip your tin can open...
2nd point, you should be getting ~nothing~ near Tokyo, with the closest assignment being "near Yokosuka", in the Sagami Nada. If you had something different, what were your orders, and where was the "landing zone"? Do you have other mods added, besides FotRSU and the patch?
3rd point, did you get into Tokyo Bay on the surface you say? So you drove over the top of sub nets and didn't get any "screech" or "SKREEEEEE!!!" sounds and hull damage?... lol