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It's the summer of 2019 in Prince William Sound Alaska.

More than 30 years have passed since the Exxon Valdez oil tanker ran a ground on a reef,

spilling its cargo of crude oil and tipping Exxon into the worst crisis in its history.

For a time, the eyes of the world seem fixed on this remote corner of Alaska.

But now the international media has long since moved on.

It has the waves sparkle in the summer sun, surrounded by steep mountain slopes.

It's almost as if the devastating oil slick never happened.

What looks can be deceiving.

Even decades later, there are still scientists hard at work tracking the damage caused by the spill.

Today, a small research vessel motors through Prince William Sound.

In the ship's wheelhouse, Craig Matkin, a whale researcher in his late 60s,

peers out over the bow with his binoculars.

Sitting beside him also armed with binoculars is a young journalist who's on board to interview the scientist

about his work and the lingering effects of the Exxon Valdez oil spill.

Craig suddenly points out the window.

There.

In the distance, a dark fin arcs over the waves before disappearing beneath the water again.

Several more quickly follow.

It's a pot of orcas, a family of killer whales.

Oh, that's amazing. Yeah, that sure is.

Craig lowers his binoculars and flips through an open binder on his lap.

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