loodusliku lasundiga kaetud tühik maapõues, kus selle suuruse ja ligipääsetavuse tõttu saavad viibida inimesed, samuti muu tühik maapõues, milles on allmaakaeveõõnele iseloomulikud ohud ja kus saavad viibida inimesed
All undergound workings must have access to the surface via at least two separate outlets which are soundly constructed and readily accessible to underground workers.
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