Inside efforts to restore the Chesapeake Bay's oyster population

As the sun rises over the Little Choptank River in Dorchester County, Maryland, a crew is hard at work responding to a crisis underwater that's been unfolding for centuries: the declining population of the native Chesapeake Bay oyster.

Due to over-harvesting, pollution and disease, more than 99% of the historic native oyster population has disappeared.  The state of Maryland has committed to a restoration plan looking to rebuild oyster colonies in five tributaries on its side of the bay.