Liquid ocean discovered beneath Mars surface

Deutsche Welle :
Mars has a massive, liquid water ocean, according to new analysis of data from Nasa’s retired InSight lander. InSight was launched in 2018, with a mission to record seismic activity on the Red Planet and quickly detected that Mars was still alive.
The new analysis is yet another piece of evidence to suggest that water wasn’t vaporized when the planet lost its atmosphere billions of years ago, or that water is confined to the polar ice caps. But accessing the water is practically impossible.
Instead of being a surface ocean, the water is distributed throughout layers of rock, starting at least 11km beneath the planet’s crust.
Calculations made by researchers from the University of California San Diego and Berkeley estimate there’s enough liquid water infused through the rock to create a planet-wide ocean spanning two kilometers in depth.
But with no drill capable of burrowing that far on Earth, there’s little hope of achieving the feat on Mars.
In the absence of technology to drill deep into Mars’s mantle, the scientists said they analyzed wave data to understand the composition of the planet’s crust and the material held inside.
That data was collected by the Mars InSight lander during its four-year mission, which ended in December 2022.
Among its data collection were recordings of so-called ‘Mars Quakes’ and meteor impacts that cause surface motion on the planet and InSight recorded the speed that seismic waves travel during these events.
The research group used rock physics models to calculate the properties of Mars’ crust when these fast-travelling waves pass through.