Additional evidence for cave:

• many places are referred to as “holes”
• many people are referred to as “moles”
• Peter dutton looks like a cave troll/gollum
• one of most internationally famous musicians is nick cave
• coober pedy
• very humid, like a cave
• white english people, who have perfectly adapted to live in cave-like conditions, wanted to colonise it

Additional evidence against:

• high real estate costs
• hot
• weather patterns