Depends on type. Of the ones I've flown (cruise speed): S300CBI - 70 kts. R22/44 - around 100. EC135 - 120 kts. EC225 - 145 kts. So not that fast... The current speed record held by the Lynx is 173 kts. But once you start flying that fast in a helicopter things start to shake quite a bit and you dont feel very comfortable, like going 100 mph in an old car! :)
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bunker (plural bunkers) (military) A hardened shelter, often buried partly or fully underground, designed to protect the inhabitants from falling bombs or other attacks. (Britain) A large container or bin for storing coal, often built outside in the yard of a house.