I don't know if this is a real Easter Egg. But it gives some reference in my perspective. I think this is a reference to Airwolf. There is a Cave called "Howling Cave" a reference to a Wolf. In that cave there is a helicopter for no reason at all, because it's hard to get out of the cave. There is also a Eagle Hawk hanger inside of the helicopter, a reference to Airwolf's main character Stringfellow Hawk. So a helicopter in a Wolf's Cave. A Hawk hanger. Can only be Airwolf.
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