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Mumbai has been given a makeover: Suspension bridges span its seaways, as well as its infamous slums, and new metro lines have been carved beneath its Art Deco and Indo-Saracenic facades and rumbling commuter railways.

A vast seaway with swift currents separated North and South America, and most animals were unable to cross -- with a few notable exceptions.

They're also the oldest bat fossils from Central America, preserved 20-million years ago when Panama and the rest of North America were separated from southern landmass by a seaway at least 120 miles wide.

Under one scenario the collapse would have allowed three of the populations to come together once again via seaways, leaving the East Antarctica octopuses isolated.

The accident, in which 27 people including a 7-year-old girl died, is the worst on record involving migrants in the narrow seaway separating France and Britain.