1971/38: City Beneath the Sea 1971

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https://m.ok.ru/video/91912800906 

https://en.wikipedia.org/wiki/City_Beneath_the_Sea_(1971_film)  

https://www.moriareviews.com/sciencefiction/city-beneath-the-sea-1970-one-hour-to-doomsday.htm

https://eofftvreview.wordpress.com/2020/11/25/city-beneath-the-sea-1971/ 

https://mikesmoviecave.blogspot.com/2015/09/city-beneath-sea-1971-review.html