I think this was the old borehole, they specifically didn't penetrate the lake so as to not contaminate it. They're using a different method or an adjacent hole

I think this was the old borehole, they specifically didn't penetrate the lake so as to not contaminate it. They're using a different method or an adjacent hole with a sanitized drilling apparatus now. This is based on stories I've read about Vostok over the years, I don't have any extra knowledge on the situation there today.