I vaguely remember it in the series. I have a tiny model of it that came with a flying sub kit.
Superb and thanks for the pic Kev!
I remember it from the original movie and IIRC it appeared in the first series prior to the much cooler Flying Sub being introduced.
Yep, its certainly in the shadow of the flying sub Yorkie. Don't think I had a flying sub toy as a kid though either. There was a REMCO toy but I didn't have one.
It appeared in the film version quite prominently, think the Seaview was navigating a minefield and the sub helped clear the mines