There's at least one volcano, on this planet, that is so large that geologists classify it as a "supervolcano". Looking back at the geological history of the Earth, this volcano has erupted once every hundred thousand years, like clockwork. Just like Old Faithful. Some of its past eruptions have possibly been responsible for mass extinctions of species on this planet, that's how big it is. How come nobody has seen this volcano? Well, apparently, the last time it erupted, its eruption was so big that it didn't leave a cone.
The cone is the visible part of the volcano, that is, the mountain. Mt. St. Helens, in Washington State, is a volcano; the mountain itself is the cone. When it erupted back in 1980, its eruption was so big it blew off a big chunk of the cone. You can see this by looking at pictures of it before and after its eruption; you would see that a big chunk of the top is missing. This is not uncommon in big volcanos.
Well, this supervolcano, when it last erupted, the eruption was so big that it blew away the entire mountain around it. That's why nobody can see it. It's still there, it's just that all that's left is the underground part, which is the important part, the part that causes eruptions.
Where is this supervolcano? Like I said, it's still where it's always been. Today, it's known as Yellowstone National Park.
Think about it. Yellowstone is famous for its hot springs, and geysers. Just like Old Faithful. Most people don't know this, but they even have entire lakes of boiling water; every once in a while you'll hear about some hiker or camper who doesn't know any better (the rangers do their best to keep people out of dangerous areas, of course, but people find these things anyway), dives into the wrong lake, and is boiled alive.
Why does Yellowstone have lakes of boiling water? Because it's the top of a volcano.
So. Now we have this giant volcano, the size of a state, that when it erupts it could wipe out entire species. Oh yeah, there is one more thing. Remember how it erupts ever hundred thousand years, like clockwork? Well, right now, in the twenty-first century, the next eruption is actually a couple of thousand years overdue. Geologists have no idea why it's being delayed, or when it might erupt again, or how big it might be this time. It will probably be accompanied by other volcanos around the world, as well as earthquakes, and God knows what all else.
And you were worried about a few billion gallons of oil.
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