1973/20: The Neptune Factor 1973

 Trailer:

Watch movie:

https://youtu.be/yrDeE0ZfSw8?si=RxwLdWX61YgA8dCt 

https://en.wikipedia.org/wiki/The_Neptune_Factor 

https://www.moriareviews.com/sciencefiction/neptune-factor-an-undersea-odyssey-1973.htm 

https://eofftvreview.wordpress.com/2022/03/25/the-neptune-factor-1973/ 

https://haphazardstuff.com/the-neptune-factor-1973-movie-review/