In Andrew Trauki’s Black Water: Abyss, five friends set out to investigate an unexplored cave system in Australia, only to discover that the cave is inhabited by a crocodile with a hankering for fresh meat.  It’s a bit like someone decided it would be a good idea to mash together Lake Placid and The Descent (two movies I adore, despite their flaws) – but unfortunately, Black Water: Abyss lacks both the campy charm of the…