Just to get back on topic for a sec. (trying to be positive) I meant to (but forgot to) say that I never thought the underwater zombie vs shark in ZFE was any good, apart from enjoying the bravery of the actors. It always looked a bit naff for me. This new blu-ray opened my eyes to it, because I've only ever seen this movie on crappy transfers, and scenes such as this show how you can see a film in a slightly different light when it's dealt with well.
I should also point out that I usually watch Italian exploitation 'trash' while enjoying a cold one, so my opinions are usually inconsistent.
Now, why don't Arrow do us a favour and put out the sequel, which I think is actually more fun, due to a bit of Mattei and Fragasso action.