July 28, 2015 — Aboard the Bob Barker, in the South Atlantic — As the Thunder, a trawler considered the world’s most notorious fish poacher, began sliding under the sea a couple of hundred miles south of Nigeria, three men scrambled aboard to gather evidence of its crimes.

In bumpy footage from their helmet cameras, they can be seen grabbing everything they can over the next 37 minutes — the captain’s logbooks, a laptop computer, charts and a slippery 200-pound fish. The video shows the fishing hold about a quarter full with catch and the Thunder’s engine room almost submerged in murky water. “There is no way to stop it sinking,” the men radioed back to the Bob Barker, which was waiting nearby. Soon after they climbed off, the Thunder vanished below.

It was an unexpected end to an extraordinary chase. For 110 days and more than 10,000 nautical miles across two seas and three oceans, the Bob Barker and a companion ship, both operated by the environmental organization Sea Shepherd, had trailed the trawler, with the three captains close enough to watch one another’s cigarette breaks and on-deck workout routines. In an epic game of cat-and-mouse, the ships maneuvered through an obstacle course of giant ice floes, endured a cyclone-like storm, faced clashes between opposing crews and nearly collided in what became the longest pursuit of an illegal fishing vessel in history.

Industrial-scale violators of fishing bans and protected areas are a main reason more than half of the world’s major fishing grounds have been depleted and by some estimates over 90 percent of the ocean’s large fish like marlin, tuna and swordfish have vanished. Interpol had issued a Purple Notice on the Thunder (the equivalent of adding it to a Most Wanted List, a status reserved for only four other ships in the world), but no government had been willing to dedicate the personnel and millions of dollars needed to go after it.

So Sea Shepherd did instead, stalking the fugitive 202-foot steel-sided ship from a desolate patch of ocean at the bottom of the Earth, deep in Antarctic waters, to any ports it neared, where its crews could alert the authorities. “The poachers thrive by staying in the shadows,” Peter Hammarstedt, captain of the Barker, said while trying to level his ship through battering waves. “Our plan was to put a spotlight on them that they couldn’t escape.”

Read the full story at The New York Times