Japanese repaired a giant sinkhole in just a few days

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Workers in Japan took just days to fill a sinkhole that stretched across a five-lane road.

The sinkhole appeared early last week in a southwestern Japanese city outside a busy railway station. Surrounding buildings were evacuated as it threatened to take structures down with it.

One bystander told the Kyodo News Agency, "The electricity went off suddenly, and I heard a loud boom."

SEE MORE: This Sinkhole Swallowed More Than A Dozen Cars In Florence, Italy

But the quick repair — which included reinstalling electricity, water, sewage, gas and telecommunication lines and resurfacing the road — illustrates Japanese engineering and efficiency.

The speed with which the construction workers completed the task was reminiscent of the effort to reopen damaged roads after the March 2011 triple disaster. More than 18,000 people died after a tsunami was triggered by the strongest recorded earthquake ever in Japan. The tsunami destroyed whole towns and caused a triple meltdown at the Fukushima Daiichi nuclear power plant.

See in and around the massive sinkhole:

10 PHOTOS
Huge Japanese sinkhole spans five lanes of traffic
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Huge Japanese sinkhole spans five lanes of traffic
A huge sinkhole is seen at an intersection near Hakata station in Fukuoka, Japan, November 8, 2016 in this photo taken by Kyodo. Mandatory credit Kyodo/via REUTERS 
A huge sinkhole is seen at an intersection near Hakata station in Fukuoka, Japan, November 8, 2016 in this photo taken by Kyodo. Mandatory credit Kyodo/via REUTERS
A huge sinkhole is seen at an intersection near Hakata station in Fukuoka, Japan, November 8, 2016 in this photo taken by Kyodo. Mandatory credit Kyodo/via REUTERS 
This combo shows a photo of a giant sinkhole (R), measuring around 30 metres (98 feet) wide and 15 metres deep, which appeared in a five-lane street in the middle of the Japanese city of Fukuoka on November 8, 2016 and another photo (L) of the same section of road after repairs were made on November 15. The Japanese city on November 15 reopened the busy street that collapsed into a giant sinkhole, with efforts of crews who worked round the clock for a week drawing raves on social media. / AFP / JIJI PRESS / JIJI PRESS / Japan OUT (Photo credit should read JIJI PRESS/AFP/Getty Images)
This combo shows a photo of a giant sinkhole (L) measuring around 30 metres (98 feet) wide and 15 metres deep, which appeared in a five-lane street in the middle of the Japanese city of Fukuoka on November 8, 2016 and another photo (R) of the same section of road after repairs were made on November 15. The Japanese city on November 15 reopened the busy street that collapsed into a giant sinkhole, with efforts of crews who worked round the clock for a week drawing raves on social media. / AFP / JIJI PRESS / JIJI PRESS / Japan OUT (Photo credit should read JIJI PRESS/AFP/Getty Images)
Personnel are seen by a giant sinkhole as they work to fill the hole that appeared in the middle of Fukuoka's bustling business district, swallowing part of a five-lane street, on November 9, 2016. Workers dumped huge amounts of wet cement and sand into the gaping hole, measuring around 30 metres (98 feet) wide and 15 metres deep, that had exposed support columns of nearby buildings at a traffic intersection. / AFP / JIJI PRESS / STR / Japan OUT (Photo credit should read STR/AFP/Getty Images)
Personnel are seen by a giant sinkhole as they work to fill the hole that appeared in the middle of Fukuoka's bustling business district, swallowing part of a five-lane street, on November 9, 2016. Workers dumped huge amounts of wet cement and sand into the gaping hole, measuring around 30 metres (98 feet) wide and 15 metres deep, that had exposed support columns of nearby buildings at a traffic intersection. / AFP / JIJI PRESS / STR / Japan OUT (Photo credit should read STR/AFP/Getty Images)
A giant sinkhole is seen in a five-lane urban boulevard, exposing support columns of nearby buildings at a traffic intersection in Fukuoka, southwestern Japan, on November 8, 2016. A giant sinkhole, measuring around 20 metres (66 feet) by 15, appeared in the middle of a busy Japanese city on November 8, swallowing part of a five-lane street near the main railway station. / AFP / JIJI PRESS / JIJI PRESS / Japan OUT (Photo credit should read JIJI PRESS/AFP/Getty Images)
This photo shows a giant sinkhole (C) in a five-lane urban boulevard, eroding soil and exposing underground steel columns supporting commercial buildings in Fukuoka, southwestern Japan, on November 8, 2016. No injuries were reported as the accident occurred in the early morning hours. / AFP / JIJI PRESS / STR / Japan OUT (Photo credit should read STR/AFP/Getty Images)
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As for this recent sinkhole, The Guardian reports that workers filled it with 6,200 cubic meters of sand and cement.

One local official told CNN that nearby construction to expand the city's subway line might have caused the collapse.

SEE MORE: As Japan's Population Ages, Its Economy Can't Keep Up

Any hole in the ground created by wear and tear and water drainage can be considered a sinkhole. They are frequently caused by natural processes but can also be the result of human activity. Their actual size does not matter, but they can be just a few feet across or large enough to swallow entire buildings.

Sinkholes also come in different varieties: Those created over time are called cover-subsidence sinkholes, and those that suddenly appear are called cover-collapse sinkholes.

No one was reported injured in the sudden collapse. The roadway reopened a week later on Tuesday.

Related: Take a look at just how often these sinkholes occur:

17 PHOTOS
Massive, shocking sinkholes from around the world
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Massive, shocking sinkholes from around the world
SOLIKAMSK, RUSSIA - NOVEMBER 20: A view of a sinkhole stretching 20 by 30 meters at the Solikamsk-2 mine on November 20, 2014 in Solikamsk, Perm region, Russia. (Photo by Uralkali Press Center/TASS/Anadolu Agency/Getty Images)
SOLIKAMSK, RUSSIA - NOVEMBER 20: A view of a sinkhole stretching 20 by 30 meters at the Solikamsk-2 mine on November 20, 2014 in Solikamsk, Perm region, Russia. (Photo by Uralkali Press Center/TASS/Anadolu Agency/Getty Images)
TORONTO, ON - JULY 9 - A sinkhole on Disco Rd. near the Hwy 427 is seen as a result of Monday's rain storm. July 9, 2013. (Andrew Francis Wallace/Toronto Star via Getty Images)
Buildings collapse into a sinkhole at the Summer Bay Resort on U.S. Highway 192 in Clermont, Florida, Monday, August 12, 2013. No one was injured but about three dozen resort goers left behind car keys, medication and other personal belongings inside their luxury condominiums after the crumbling edifices were evacuated. (Red Huber/ Orlando Sentinel/MCT via Getty Images)
TORONTO, ON - JULY 9: A sinkhole opened up on Disco Road at Hwy 427 after a massive storm and flooding in the GTA. (Andrew Francis Wallace/Toronto Star via Getty Images)
CHICAGO, IL - APRIL 18: Workers pull a truck from a sinkhole that opened up on a residential street in the South Deering neighborhood on April 18, 2013 in Chicago, Illinois. The driver of the truck was hospitalized after driving into the 15-feet-deep hole while on his way to work. Two other vehicles were also swallowed by the sinkhole. (Photo by Scott Olson/Getty Images)
CHICAGO, IL - APRIL 18: Workers prepare to pull a truck from a sinkhole that opened up on a residential street in the South Deering neighborhood on April 18, 2013 in Chicago, Illinois. The driver of the truck was hospitalized after driving into the 15-feet-deep hole while on his way to work. Two other vehicles were also swallowed by the sinkhole. (Photo by Scott Olson/Getty Images)
Rescuers cover a dead body found in a sinkhole on a road in Shenzhen, south China's Guangdong province on May 21, 2013. Five people died when a 10 metre (33 feet) wide sinkhole opened up at the gates of an industrial estate in Shenzhen, the southern Chinese boom town neighbouring Hong Kong, local authorities said on May 21. CHINA OUT AFP PHOTO (Photo credit should read AFP/AFP/Getty Images)
Workers block off the site of a huge sinkhole which occured overnight on Shiliuzhuang road, in Beijing on April 26, 2011. A section of the road collapsed beneath a truck, slightly injuring the driver and a passenger, who both jumped out the vehicle beforeit sank into the hole, as an authoritiy suspects the hole was caused by the construction of a subway line. CHINA OUT AFP PHOTO (Photo credit should read STR/AFP/Getty Images)
A truck lies in a sinkhole which occured overnight on Shiliuzhuang road, in Beijing on April 26, 2011. A section of the road collapsed beneath a truck, slightly injuring the driver and a passenger, who both jumped out the vehicle beforeit sank into the hole, as an authoritiy suspects the hole was caused by the construction of a subway line. CHINA OUT AFP PHOTO (Photo credit should read STR/AFP/Getty Images)

Large sinkhole at the Dead Sea coast Israel

(Photo: Getty Images)

Workers have been working around the clock to fix a broken water main on northbound I-25 at the 58th Ave. exit on Sunday, February 10, 2008. A workmen monitor the filling of the hole around the repaired pipe (the white one at bottom of photo) with FlashFill, a flowable fill material. As Doug Sandrock (right) of Denver Water said, 'It's like waiting for the swimming pool to fill.' They were racing to try and get the road back for tomorrow's rush hour. Cyrus McCrimmon, The Denver Post (Photo By Cyrus McCrimmon/The Denver Post via Getty Images)
Workers block off the site of a huge sinkhole which occured overnight on Shiliuzhuang road, in Beijing on April 26, 2011. A section of the road collapsed beneath a truck, slightly injuring the driver and a passenger, who both jumped out the vehicle beforeit sank into the hole, as an authoritiy suspects the hole was caused by the construction of a subway line. CHINA OUT AFP PHOTO (Photo credit should read STR/AFP/Getty Images)
CHEVY CHASE, MD - DECEMBER 3: A car sits in a sinkhole caused by a broken water main, which collapsed part of Friendship Blvd. on December 3, 2010 in Chevy Chase, Maryland. No one was reported injured in the accident. (Photo by Logan Mock-Bunting/Getty Images)
Members of a construction crew use jackhammers in a sinkhole at an intersection on W. 48th Street, New York, New York, 1958. (Photo by Weegee (Arthur Fellig)/International Center of Photography/Getty Images)
Police officers and others look at a sinkhole caused by flooding, New York, New York, mid 20th century. (Photo by Weegee (Arthur Fellig)/International Center of Photography/Getty Images)
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