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Listen to The Hadean eon by following these instructions.
1. Line the Dogleg Tunnel with flame throwers.
2. Seal both ends of the tunnel.
3. Fill the tunnel with a composition of 70% Carbon Dioxide, 11.5% Methane gas, 8.2% Hydrogen gas, 7% Water Vapour, and 3.3% of a noble gas of your choice.
4. Ignite the flame throwers and heat the tunnel atmosphere to 230 degrees Celsius.
5. With megaphones and microphones on each end, have a conversation with a friend through an atmosphere four billion years old.