Hello all, I'm trying to find a film I watched when I was younger, I have a very vague memory of it. I would love to see it again before I forget completely about it.

What I remember is that it starts off with a motorcyle or car accident and then the people involved are taken to a lab somewhere close where they are helped, think the boyfriend dies but then he comes back alive, like a zombie. This bit makes me think it's Cronenberg's Rabid.
However I remember one other scene is where a group of them are travelling through the sewers and they're about to climb out/up and one of them who is infected or something suddenly mutates, his neck grows abnormally long and he starts attacking his counterparts. Unfortunately that's all I remember.

Anyone any idea?