I just picked up a cheap copy of
Destination Tokyo, and watched it for the first time in probably fifty years.
Much to my surprise, it was a pretty good sub movie! Had some of the olde cliches, including the true story of an on-board appendix removal, and a 'man-goes-crazy-under-depthcharging' scene that predates
Das Boot by almost forty years.
The plot is total BS, but the acting is good, the sub interiors are real and the modelwork and special effects are superb!
I highly recommend it.