http://en.wikipedia.org/wiki/Hudson_Terminal#Hudson_Terminal http://www.nytimes.com/slideshow/2008/10/27/nyregion/20081027_TUNNEL_SLIDESHOW_3.html
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Although SF isn't an island like Manhattan is, the SF Bay needed an underwater BART tunnel as much as NY&NJ needed its PATH tunnels under the Hudson River.
While the forerunner of PATH was up & running by 1908, BART didn't start until 1974.
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{BART began regular passenger service on September 11, 1972, reporting more than 100,000 passengers in its first five days of operations.} http://en.wikipedia.org/wiki/History_of_the_Bay_Area_Rapid_Transit#Operation
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As BART opened on September 11, the M2 part of the Istanbul Metro commenced on that date.
{Construction of the Istanbul Metro, also known as the M2, began on September 11, 1992, but faced many challenges due to the numerous archaeological sites that were discovered during the drilling process, which slowed down or fully stopped the construction of many stations. Taking into account the seismic activity in Istanbul, the entire subway network was built with the cut-and-cover method to withstand an earthquake of up to 9.0 on the Richter magnitude scale.}
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The Marmaray Tunnel is on the scale of the BART Transbay_Tube.
