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.