Interesting article on underwater currents melting the ice sheets from below. Not really high strangeness though.

"The vehicle, called Ran, had spent weeks scanning an ice area roughly fifty square miles, revealing patterns that upend simple melt models.

In the east and center, Ran saw icy terraces stacked like steps, while the west looked smoother, with channels and scooped depressions.

None of these terraces or teardrop pits show up on satellite images, so they had remained completely hidden until Ran’s mission."

The amount of HighStrangeness lore connected to Antarctica is extensive.

This is not weird or highly strange at all.
The mental bias is that UUV work flawlessly, which they in fact, do not.
They are very susceptible to flooding and sinking. Once the water gets in, the vehicle looses power and sinks to the bottom.
At that point, it is no longer worth a salvage operation, since ship operational time is very expensive, and other experiments are planned.

The Strava leak showed movement underwater near the one famous area. An underwater base or maybe the rumor is true that there is an ancient railroad from the Himalayas to Antarctica.