Pacific Ocean
"The long-term warming trend driven by human activities continued unabated," researchers said.
The Revillagigedo Archipelago National Park spans more than 57,000 square miles — roughly the size of Georgia.
WHAT'S HAPPENING
NOAA has described the phenomenon as a "river in the sky."
It's a "death sentence for the walrus," a conservation group said.
The consequences could be devastating, experts warn.
Kim Jong Un said the test was necessary to undertake more exercises with the Pacific as the target.