Reviewed by GREG KING Director: Alister Grierson Stars: Richard Roxburgh, Ioan Grufford, Rhys Wakefield. A group of cave divers are exploring the Esa-ala caves in New Guinea, one of the world’s largest underground cave systems. The expedition has been financed by obnoxious American entrepreneur Carl Hurley (hunky Hornblower star Ioan Grufford), an amateur adventurer himself. Leading the expedition is the …