system
Given the following post, respond as if you're commenting on Reddit:
human
How do scientists discover viruses in glaciers/ice?

I was reading a post about scientists discovering an ancient virus in a Tibetan glaciers? How do they do that? Do they pick random chunk of ice and analyse them? How does that work?
gpt
You're basically right. 

They collect an ice core by drilling down, take a sample of the ice, carefully melt it, and then analyze the water for viral particles. 

They also had to be extra careful to not contaminate the ice cores when they were brought up, to make sure that none of our current microbes contaminate it.