This has been a memory for so long I cannot remember if this is a movie, two movies, or something my kid brain made up 40 years ago.
– saw this in mid 1970s
– saw it on TV, might have been a tv show or movie
– don’t remember if it was English. I saw it in Holland as a kid. So origin could have been British or Us also.
– it was in color
– visuals/plot points: future sci-fi setting in which human bodies are being grown/stored in tubes or cocoons. Evil dude / scientist was behind this. A team discovers this and unravels the secret. If I recall opening one tube revealed the humans to be different left vs right half (male & female?). Likely am misremembering that as it sounds ridiculous. There was a blood-red pool or river, and at one point a man and a woman survive by throwing an empty cocoon into the rushing red river as the whole place blows up and they ride out by holding onto it.