2 nameless movies from 80's Help me name 2 movies I watched as kid in 80’s.I only membr fragments so bare w/me?

1st movie Might’ve been old horror movie. People gather @ house on a hill. I remember seeing a car driving along side of the mountain to get there. Might’ve been a pool scene with a woman swimming late at night & some1 turned on the pool cover while she was underwater trapping her letting her drown. Another scene with some1 bed bound, perhaps ill. There's a room divider/curtain up so u cant c who's on other side, think it was an older ill person.Plus I think there might’ve been something bout a ring.Maybe it was on his/her hand and it was scene when they grabbed one of the visitors arm.??

2nd movie: Jane Doe/Buried Alive movie.some1(kid maybe) walking in woods & finds a hand coming out of ground. lady buried alive, becomes Jane Doe & some guy(cop?) takes care of her & investigates.

That’s all I got. Please give me some titles if u can & I’ll check em out.1st right title/or 1 to lead me in right direction gets the points…thnks