This is not a drill.
這不是演習
This is not a false alarm.
Hawaii
Hawaiian
'This is not a drill': Hawaiians get false alert of missile attack due to ...
'This Is Not A Drill': A False Ballistic Missile Alert Shakes Hawaii
//=== https://www.npr.org/sections/thetwo-way/2018/01/13/577871075/this-is-not-a-drill-a-false-ballistic-missile-alert-shakes-hawaii
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A Hawaii Civil Defense Warning Device will sound an alarm during natural disasters. In December, the Hawaii Emergency Management Agency tested a statewide alert tone signaling nuclear threat.
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Hawaii residents and tourists alike were shaken shortly after 8 a.m. local time Saturday when a push notification alerted those in the state to a missile threat, causing an immediate panic until officials confirmed it was a false alarm.
Emergency Alert
"BALLISTIC MISSILE THREAT INBOUND TO HAWAII. SEEK IMMEDIATE SHELTER. THIS IS NOT A DRILL,"
read the message, which also blared across Hawaiian televisions stations.
Rep. Tulsi Gabbard, D-Hawaii, confirmed the false alarm on Twitter 12 minutes after the errant message was sent. But it took about 38 minutes for another push notification to arrive on phones declaring there was no real danger.
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Vern Miyagi, the agency's administrator, apologized and said the false alarm was caused by a "human error," when the wrong button was pushed during a shift-change drill.
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drill rig
drilling rig
offshore oil rig
https://en.wikipedia.org/wiki/Drilling_rig
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A drilling rig is a machine that creates holes in the earth sub-surface.
Drilling rigs can be massive structures housing equipment used to drill
water wells, oil wells, or natural gas extraction wells,
or
they can be small enough to be moved manually by one person and such are called augers
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Drilling rigs can be mobile equipment mounted on trucks, tracks or trailers, or more permanent land or marine-based structures (such as oil platforms, commonly called 'offshore oil rigs' even if they don't contain a drilling rig).
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The term "rig" therefore generally refers to the complex equipment that is used to penetrate the surface of the Earth's crust.
It is also referred to as a Hoopanoo as slang in certain parts of the United States of America.
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Auger drilling
Auger drilling is done with a helical screw which is driven into the ground with rotation; the earth is lifted up the borehole by the blade of the screw. Hollow stem auger drilling is used for softer ground such as swamps where the hole will not stay open by itself for environmental drilling, geotechnical drilling, soil engineering and geochemistry reconnaissance work in exploration for mineral deposits. Solid flight augers/bucket augers are used in harder ground construction drilling. In some cases, mine shafts are dug with auger drills. Small augers can be mounted on the back of a utility truck, with large augers used for sinking piles for bridge foundations.
Auger drilling is restricted to generally soft unconsolidated material or weak weathered rock. It is cheap and fast.
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Percussion rotary air blast drilling (RAB)[edit]
RAB drilling is used most frequently in the mineral exploration industry. (This tool is also known as a Down-the-hole drill.) The drill uses a pneumatic reciprocating piston-driven "hammer" to energetically drive a heavy drill bit into the rock. The drill bit is hollow, solid steel and has ~20 mm thick tungsten rods protruding from the steel matrix as "buttons". The tungsten buttons are the cutting face of the bit.
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Air core drilling
... Where possible, air core drilling is preferred over RAB drilling as it provides a more representative sample.
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Cable tool drilling
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These slow rigs have mostly been replaced by rotary drilling rigs in the U.S.
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this drilling method has largely been supplanted in recent years by other, faster drilling techniques, it is still the most practicable drilling method for large diameter, deep bedrock wells, and in widespread use for small rural water supply wells.
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Cable tool rigs now are nearly obsolete in the United States. They are mostly used in Africa or Third-World countries.
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