Marine Boy Oh yes I remember. I use to run home from school to catch it on TV. I was a well thought concept. Great characters and craft. Although I enjoyed all Japanese anime of the 1960's.
Marine Boy was my favourite from the lot. I bought the whole 3 seasons on DVD. Now I am reliving it all again. Having seen it after 38 years. I loved it as middle aged man the same as i did at 8.
check out the live action film in progress. Looks promising