Doomwatch (1972, d. Peter Sasdy)
A British government scientiss visits a rural, inhabited island to collect soil samples in the wake of an offshore oil spill. The scientist is greeted with hostility by the locals. They are attempting to hide an ugly secret.
Doomwatch was a theatrical release derived from a British t.v. adventure series. The first half is interesting, atmospheric, and weird. The second half is preachy and embarrassing. This is not a horror movie. Don’t get sucked in. You’ll only end up with a lot suck.