It's the entrance to Dr. Evil's lair!

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1980 300TD-China Blue/Blue MBTex-2nd Owner, 107K (Alt Blau) OBK #15
'06 Chevy Tahoe Z71 (for the wife & 4 kids, current mule) '03 Honda Odyssey (son #1's ride, reluctantly) '99 GMC Suburban (255K+ miles, semi-retired mule) 21' SeaRay Seville (summer escape pod)

Not as big as estimated, but there's an icy lake at the bottom

Some here may be right about an anatomical connection . . . it may be the result of a planetary "fart!" Now, where was the CLKMan during this event?

Scientists may have cracked the giant Siberian crater mystery — and the news isn’t good - The Washington Post

For most folks, it's actually referred to as "Berserkeley" or "The Peoples' Republic of Berkeley..." That should clue you in to what you can expect if you visit.