Millions of Crabs: An Unexplained Phenomenon

In January 2024, filmmakers documented an astonishing aggregation of millions of porcelain crabs, locally called 'changai', off the coast of Chile. These crabs densely carpeted the seabed, with more than 1,000 individuals per square meter, thriving due to nutrient-rich waters from the Humboldt Current. Factors like abundant plankton, low oxygen levels excluding other species, and reduced predators have contributed to their population explosion.

The filming process presented unique challenges, including extremely cold water and relentless surge, making steady camera work difficult. The team adapted their equipment to better capture the phenomenon. During the shoot, the crabs began filter-feeding in remarkably organized lines, a behavior that baffled experts upon their return to Bristol.

This coordinated display remained a mystery to science, underscoring how much remains unknown about marine ecosystems. The filmmakers also witnessed a feeding frenzy involving baitfish, cormorants, and sea lions amidst the crabs. The exceptional abundance of changai is linked to changing ocean conditions and human impacts, prompting reflection on the future health of our oceans.

In July 2025, a follow-up shoot occurred with local Chilean cinematographer Diego Bravo, mentored by Santiago Cabral, to capture final shots. This initiative, supported by Project Songbird, provided a valuable opportunity for an aspiring cinematographer to gain experience in natural history filmmaking.