tunnel

 (EDITORS NOTE: Image shot in black and white using a panoramic app on an iPhone 6.) A machine used to dig ISIL tunnels is seen at the Iraqi Army Armoured Ninth Division base on November 13, 2016 in Qaraqosh, Iraq. ISIL took control of Mosul, Iraq's second largest city in June of 2014. For the past two years they have occupied the city. On the 17th of October 2016. Iraqi forces began the Mosul offensive to take back the city. The offensive was a joint effort by Iraqi Government forces, the Peshmerga, local tribal militias and air support from the US and UK military. Despite early progress the offensive has slowed in the past week as Iraqi forces encountered heavy resistance from ISIL fighters entrenched inside the city. The use of an extensive tunnel system under the city built by ISIL over the past two years, booby traps, snipers and roads riddled with IED's has slowed the advance of troops on the ground. As the offensive enters its fourth week, fears of a humanitarian crisis grow as up to 1 million civilians are believed to be trapped inside the city.  (Photo by Chris McGrath/Getty Images)

Chris McGrath/Getty

A machine used to dig tunnels for Islamic State is seen at the Iraqi Army Armoured Ninth Division base in Qaraqosh, Iraq. This photo was taken using a panoramic app on an iPhone 6. Chris McGrath/Getty

A peshmerga fighter looks out of the entrance of an underground tunnel built by Islamic State fighters, Tuesday, Oct. 18, 2016. The Kurdish forces found the tunnel in the town of Badana that was liberated from the Islamic State group on Monday. The fighters built tunnels under residential areas so they could move without being seen from above to avoid airstrikes. (AP Photo/Bram Janssen)

Bram Janssen/AP

A peshmerga fighter looks out of the entrance of an underground tunnel built by Islamic State fighters. The Kurdish forces found the tunnel in the town of Badana in Iraq which was liberated from the Islamic State group on Monday. The fighters built tunnels under residential areas so they could move without being seen from above to avoid airstrikes. Photo Bram Janssen/AP. 

A performer dressed as a bird takes part in a show during the opening ceremony of the NEAT Gotthard Base Tunnel, the world's longest and deepest rail tunnel, near the town of Erstfeld, Switzerland June 1, 2016. The 57.1-km (35.5 mile)-long Gotthard Base Tunnel, 17 years under construction and designed to last a century, is part of a 23 billion Swiss franc (23.1 billion USD) infrastructure project to speed passengers and cargo by rail below the Alps, as much as 2.3 km (1.7 miles) under the mountain chain, that divides Europe's north and south.  REUTERS/Ruben Sprich

Ruben Sprich/Reuters

A performer dressed as a bird takes part in a show during the opening ceremony of the NEAT Gotthard Base Tunnel, the world’s longest and deepest rail tunnel, near the town of Erstfeld, Switzerland

Palestinian worker is lowered on a rope into a smuggling tunnel, that was flooded by Egyptian security forces, beneath the border between Egypt and southern Gaza Strip...A Palestinian worker is lowered on a rope into a smuggling tunnel, that was flooded by Egyptian security forces, beneath the border between Egypt and southern Gaza Strip November 2, 2015.  A network of Palestinian tunnels running under the frontier town of Rafah is now water-logged, destroyed by Cairo to sever what it says is a weapons smuggling route out of Gaza for Islamist insurgents in Egypt's Sinai desert

Mohammed Salem/Reuters

A Palestinian worker is lowered on a rope into a smuggling tunnel, that was flooded by Egyptian security forces, beneath the border between Egypt and southern Gaza Strip

Migrants stand next to their tent at a camp set near Calais, northern France, Wednesday, Aug. 5, 2015. Thousands of migrants have been scaling fences near the Channel Tunnel linking the two countries and boarding freight trains or trucks destined for Britain

Emilio Morenatti/AP

Migrants stand next to their tent at a camp set near Calais, northern France, Wednesday. Thousands of migrants have been scaling fences near the Channel Tunnel linking the two countries and boarding freight trains or trucks destined for Britain

Crossrail development of Farringdon platform in London, as more than 23 miles (nearly 90%) of train tunnels are now complete, with tunnelling due to finish in spring next year. PRESS ASSOCIATION Photo. Issue date: Friday November 28, 2014. Six of Crossrail   s eight tunnelling machines have now completed their drives.

Crossrail/PA

A view of the Farringdon platform part of the Crossrail development in London, as more than 23 miles (nearly 90%) of train tunnels are now complete, with tunnelling due to finish in spring next year

A Palestinian fighter from the Izz el-Deen al-Qassam Brigades, the armed wing of the Hamas movement, gestures inside an underground tunnel in Gaza

Mohammed Salem/Reuters

A Palestinian fighter from the Izz el-Deen al-Qassam Brigades, the armed wing of the Hamas movement, gestures inside an underground tunnel in Gaza.

A miner with a donkey makes his way through the low and narrow tunnel leading out of a coal mine in Choa Saidan Shah in Punjab province, April 29, 2014. Workers at this mine in Choa Saidan Shah dig coal with pick axes, break it up and load it onto donkeys to be transported to the surface. Employed by private contractors, a team of four workers can dig about a ton of coal a day, for which they earn around $10 to be split between them. The coalmine is in the heart of Punjab, Pakistan's most populous and richest province, but the labourers mostly come from the poorer neighbouring region of Khyber Pakhtunkhwa. Picture taken April 29, 2014.

Sara Farid/Reuters

A miner with a donkey makes his way through the low and narrow tunnel leading out of a coal mine in Choa Saidan Shah in Punjab province. Workers at the Choa Saidan Shah mine dig coal with pick axes, break it up and load it onto donkeys, to be transported to the surface

Crossrail construction workers on the Connaught tunnel below the Royal Docks in east London. Derelict since 2006 when rail services stopped using the route, works are taking place to deepen, strengthen and widen the structure to ensure that is ready for the arrival of crossrail trains, from 2018 up to 12 trains an hour in each direction will run through the tunnel first built in 1878 linking Woolwich to Custom House, Canary Wharf and Central London.

Chris Radburn/PA

Crossrail construction workers on the Connaught tunnel below the Royal Docks in east London. Derelict since 2006 when rail services stopped using the route, works are taking place to deepen, strengthen and widen the structure to ensure that is ready for the arrival of crossrail trains, from 2018 up to 12 trains an hour in each direction will run through the tunnel first built in 1878 linking Woolwich to Custom House, Canary Wharf and Central London.

A worker is seen inside the Cuncas II tunnel near Mauriti

Ueslei Marcelino/Reuters

A worker is seen inside the Cuncas II tunnel that will link the canals being built to divert water from the São Francisco river for use in four drought-plagued states in Brazil, a project that is three years behind schedule and has doubled in cost from the original estimate of $3.4bn, near the city of Mauriti, Ceará state

Crossrail construction...One of the Crossrail tunnels under construction 35 metres below the streets of Whitechapel, east London, which has proved to be one of the most challenging and impressive sites in the whole Crossrail project, and will be part of the 38 station route from Maidenhead Royal Berkshire in the west to Shenfield in Essex in the east. PRESS ASSOCIATION photo. picture date: Wednesday December 18, 2013. Photo credit should read; John Stillwell/PA Wire

John Stillwell/PA

A Crossrail tunnel under construction 35 metres below the streets of Whitechapel, east London, one of the most challenging sites in the Crossrail project. The completed service will run from Maidenhead and Heathrow in the west to Shenfield and Abbey Wood in the east. Construction is expected to be completed in 2017, with services running in 2018. 

Crossrail construction...Crossrail worker Sam Agyeman, inspects the first completed section of Crossrail tunnel, after tunnelling machine Phyllis completed the 6.8 kilometre, 18-month journey between Royal Oak and Farringdon. PRESS ASSOCIATION Photo. Picture date: Tuesday November 19, 2013. See PA story TRANSPORT Crossrail. Photo credit should read:

Sean Dempsey/PA

A worker inspects the first completed section of London’s new Crossrail tunnel, which will provide new train links across the UK capital to Heathrow airport. Tunnelling machine Phyllis completed the 6.8km section between Royal Oak in the west and central Farringdon after 18 months of work. Crossrail, Europe’s largest construction project, is expected to be finished in 2019. 

A tunnel worker ascends on a rope inside a smuggling tunnel dug beneath the Gaza-Egypt border in the southern Gaza Strip. Hamas is struggling to meet its payroll in the Gaza Strip, where income from taxes has been badly hit since neighbouring Egypt started destroying a network of tunnels used to smuggle food, fuel and weapons into the Islamist-run enclave. Picture taken October 8, 2013.

Ahmed Zakot /Reuters

A tunnel worker ascends on a rope inside a smuggling tunnel dug beneath the Gaza-Egypt border in the southern Gaza Strip. Hamas is struggling to meet its payroll in the Gaza Strip, where income from taxes has been badly hit since neighbouring Egypt started destroying a network of tunnels used to smuggle food, fuel and weapons into the Islamist-run enclave.