Other than real life boarding school there were 2 films that traumatised me, firstly the 1970s film ARNOLD (not good to watch at the age of eight) and secondly a film that I cannot source. Perhaps you know what it is called:
I saw parts of it by accident as a child – so my memory is a bit vague I'm afraid. Someone was being kept alive under the earth (hot country/dusty ground) and they could communicate/be fed through what looked like open ended tin can pipes. You never really saw the person underground, only glimpses of them. He/she seemed to have no hair and was very dirty. I think the person could crawl through different tunnels to different tin cans??
Someone used to visit the person underground and drove a pick up truck. Occasionally the camera would look down one of the tin pipes and you would catch glimpses of a frightened eye looking up, most likely a woman.
Thanks for reading,
— M.
I don't know the answer for the NTT but I have to say I used to watch Arnold all the time at the video store I worked at. I'm very sad that nobody has uploaded the Arnold theme song on Youtube.
Also, M. included in the traumafession this link to the same inquery elsewhere in case it might help!!!…
http://www.amazon.co.uk/forum/horror/ref=cm_cd_pg_newest?_encoding=UTF8&cdForum=Fx19JMXQX3J9OO7&cdPage=1&cdSort=oldest&cdThread=Tx1ASCWJIXBSYIC
Sounds a bit like The Longest Night. Except the victim was confined to a makeshift coffin with lights, fans, and an air supply and everything ran off a battery. I believe there was also some sort of speaker system that allowed the kidnapper above ground to communicate with the victim.
http://www.imdb.com/title/tt0068875/