A squabbling career couple (Daniel Travis and Blanchard Ryan) arrive at an exotic island resort and sign on for a chartered diving excursion, but their vacation becomes a nightmare when they surface and find their boat has vanished. Shot on a microbudget with a four-man crew, this superlative chiller by husband-and-wife team Chris Kentis (writer-director) and Laura Lau (producer) is deceptively simple and highly effective: the ocean becomes an implacable enemy as the current sweeps the divers into ever more dangerous waters, deepening their predicament and preying on our primal fears. By Andrea Gronvall