A new NASA study shows that cold water deep in the Earth's oceans hasn't warmed up since 2005 in an apparent contradiction to global warming.

NASA scientists said this raises more questions about the slowdown of global warming in recent years. They analyzed direct ocean temperature from 2005 to 2013 and found that water 1.24 miles below the surface has not warmed up.

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Scientists explain there's still an accumulation of greenhouse gases in the atmosphere. The global average surface air temperatures have stopped rising, however.

Scientists added that above 1.24 miles, the world's ocean temperatures are still climbing but not fast enough to account for the stalled air temperature.

Satellite and direct temperature data help scientists catch a glimpse of how much the sea level is rising due to deep warming.

Scientists noted that the deep-ocean warming occurring in the Earth's oceans probably refers to the warming of the upper half of the ocean below the topmost layer and up to 700 meters below the surface.

They used data coming from the Argo Buoys system used for observing temperature, salinity and currents on the Earth's oceans. They also used satellite measurements and climate simulations of sea level changes around the world.

Their study showed the global ocean absorbed more heat in the last 35 years than previously thought.

To date, NASA is monitoring the vital signs of the Earth's land, air and space using satellite, airborne and ground-based observation systems.

They're also developing new ways to observe and study the Earth's interconnected natural systems using long-term data records and computer analysis.

John Willis, one of the researchers, said they're just trying to dig deeper into the nitty-gritty details of what is happening in the ocean floor.