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rikj: Entrance to hell
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rikj: Exit
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rikj: Outfall
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rikj: Drainage adit?
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rikj: Arch
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rikj: Temptation
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rikj: Scale
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rikj: Collapse
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rikj: Metal frame and pit props.
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rikj: Get me out of here, I'm a coward!
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rikj: Slants
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rikj: Pit props
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rikj: Side entrance
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rikj: Near the start
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rikj: Looking out of downstream entrance
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rikj: Temptation - the outfall
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rikj: Oh dear