They Call it a “Silver Rush,” And It’s One of the Most Beautiful Sights in the Ocean.

Back in July 2013, diver William Mitchell was exploring an undersea cavern off the coast of Grand Cayman when he encountered something stunning. An enormous swarm of Atlantic silverside fish came out of nowhere, rushing past Mitchell in one long, continuous stream of silver.

Mitchell got a glimpse of an Atlantic silverside migration — an event that occurs each summer in the Cayman Islands — which the diving community has dubbed a “silver rush,” and for good reason.

Thankfully, Mitchell had his camera on-hand, and was able to capture this “once-in-a-lifetime” dive experience on film. Watch the footage to see Mitchell's astonishing encounter.

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