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There are several ways to build tunnels underwater.
One way is to build sections of tubes in advance, float them into position using tugboats, sink them, have divers go down and seal the sections together, and then pump the water out.
A more traditional way is to dig a tunnel far enough below the sea bottom that the rock over them keeps out the water. It's kind of like digging a mine,
If the rock or soil isn't able to keep out all the water while the tunnel is being dug, sometimes it's possible to pump compressed air into the tunnel, so the pressure inside the tunnel is greater than the water pressure outside, and have workers seal the inside of the tunnel with a concrete or steel lining.
Source(s):The wikipedia entry at http://en.wikipedia.org/wiki/Tunnel doesn't address underwater tunnelling much, but the entry at http://en.wikipedia.org/wiki/Tunnelling_… has some relevant information about how tunnels are kept from collapsing until they can be reinforced
Wiki User
∙ 14y ago
Wiki User
∙ 15y agowith a shovel. its similar to how they build the subway so they build the tunnel then push it threw the water.
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How long did it take to build the Mersey tunnel?
The Mercy tunnel took 6 years to build. The original proposal to build the Mercy tunnel goes back to 1825. Construction did not start until 1879.
What are the release dates for Build It Bigger - 2006 Mega-Tunnel?
Build It Bigger - 2006 Mega-Tunnel was released on: USA: 8 March 2006
When was Päijänne Water Tunnel created?
Päijänne Water Tunnel was created in 1982.
When was Bolmen Water Tunnel created?
Bolmen Water Tunnel was created in 1987.
What materials were used to build the channel tunnel?
Ricks
Was the Holland tunnel the first under water tunnel?
no
What is the best way to build a very secure tunnel?
One of the best ways to build a secure tunnel is with concrete. This is also one of the longer time tunnels but well worth it. It is highly recommended to make a pilot tunnel first.
Is the tunnel in US Virginia Beach build underground?
yes
How much did it cost to build the Seikan Tunnel?
¥538 billion
What are the release dates for Build It Bigger - 2006 Deepest Tunnel 1-13?
Build It Bigger - 2006 Deepest Tunnel 1-13 was released on: USA: 10 October 2007
Why did they build a rail bridge over the Firth of Forth instead of an underwater railway tunnel?
At the time that the bridge was built, technology wasn't good enough to build a tunnel of the necessary length.
How do you build a tunnel?
You can use dirt sand clay playdo and legos
