H made me watch this, as I said that I hadn’t. I did remember some parts of it while it was on. It has a plot that doesn’t really go anywhere, vintage 1978 model making and layering effects and some really questionable bits of science.

But mostly it has just left me thinking but why!
How does the submersible propel itself?
Why did she have to stay behind?
Why was the monster attack so unimportant?
Just why..

Other than that it was harmless enough to watch while I was getting on with other things.