Is it legal for me to leave a Pass Phrase at the South Pole?

I'm not sure exactly where I should ask this, so I'll try here.

I'm going to the South Pool soon, and I wanted to leave a stainless steel plate with a wallet pass phrase on it containing a small amount of crypto.

I just want to see how long until somebody makes the return trip just to access those funds.

Is there anything I should worry about by doing this?

I love geocaching and have left previous pass phrases around the US years ago, and each had 1 ETH. Only 4 of the 12 were accessed. US law is OK with it, but Antarctica is under different laws.

Thoughts?

Edit: So it sounds like I should be fine doing it. Any prep I should do to the stainless steel plate so it holds up for the time it's there? Bare metal with the words punched in was my plan.

Also, the remaining ETH drops are around Chicago, Philly and SF. I don't remember the exact cords as they were placed a couple years ago. Best I can remember was one near Monk's and one near Hotel Vitale.