“As the creature grew larger, it became apparent that Plessie was not a Plesiosaurus at all, but a species of crocodile. Marine biologist Zachary Wallace added to the controversy by claiming the creature was a Purussaurus, an extremely dangerous predator that dated back to the Miocene era. Wallace warned residents that the pen would not be able to contain the animal, which now exceeded three meters in length and was predicted to grow five to six times that size. A larger containment area was cordoned off at Loch Dochfour, a narrow waterway at the head of Loch Ness, with a series of gates established to secure a seven-acre pen. An observation galley was erected in time for tourist season, providing visitors with a bird’s-eye view of the pen’s truck-sized occupant.

“For the next four years, Plessie made the Scottish Highlands the number one tourist destination in the world, the crocodile surpassing sixteen meters and weighing an estimated thirty tons, ten times the weight of a double-decker bus. During the warmer months, the croc spent its days sunning itself on the walled shoreline, to the delight of onlookers. At night and throughout the winter, she remained underwater in the muddy bog. When her handlers attempted to flush her back to the surface after a long winter’s hibernation, they discovered that the underwater gate separating Dochfour from Loch Ness had been ravaged.

“A massive search began in the Great Glen. During the investigation that followed, one handler told authorities that three months prior to Plessie’s escape, keepers had so feared the creature that they’d kept it on a steady diet of tranquilizers. As the weather turned cold, the croc, now a juvenile adult, spent more time underwater, gradually weaning its system off the drugs, affording it the opportunity to escape.

“Throughout March and into late spring, there were no sightings. Many believed Plessie was dead, poisoned by Loch Ness’s heavy peat content. Others claimed the crocodile was secretly being fed from Aldourie Castle’s subterranean caverns. Water bailiffs reported that the local deer population no longer crossed Loch Ness. When a reptile claw footprint measuring two meters was found on the shoreline near Foyers on May 29, residents grew worried.

“The first probable attack on a human being took place two weeks later, when the remains of a fishing boat piloted by Glasgow resident Martin McCandless washed up on the shores of Tor Point. Police painted a grim picture. The creature had bludgeoned the keel from below, sinking the vessel and taking its lone occupant. Still, with no overwhelming forensic evidence to indicate a change in the creature’s diet, Inverness officials waited to exercise boating restrictions on the loch.