Yep 😭😂. I think it's due replacement!

Here we are trying to image the sea/ice interface on the Brunt ice shelf. It's quite mushy and not a clear divide, and could be anywhere between 60-200 m thick, as we can't tell from the radar alone. Hopefully lots of stacked hammer hits will tell us!

This is a type of silicone! It means the plate doesn't freeze to the ground when you hit it, and helps make a nice impulsive source when the hammer hits and bounces back.