I'm posting this YouTube video of what is being called a 'Super Mega-pod' of Dolphins. The explanations I've read run the gamete from 'they're escaping Navy Sonic booms that can make them go deaf', 'they're running from the Russian Chelyabinsk meteor sonic boom', right up to the expected laments of 'Repent, the end of life is nigh!'
Whatever the reason, the pod contained thousands, if not tens of thousands of racing dolphins in pod that measured seven miles by five miles. I wish the heck I'd been on that boat to view the sight.