underwater sf sub film

And possibly my favourite of tonight's rattle bag of You Tuber clips by NKGT5656 of Japan, this scintillating footage of an amazing model sailing underwater.

I don't know what the model yellow sub actually is [anyone?] but it reminds me completely of the WOMBAT seen in Stingray [I think?]

and also the as yet unseen Salvage Craft from the Tri-ang Space range of toys