evidence: The geology of the Kerch Strait is difficult: it has a tectonic fault, and the bedrock is covered by a 60 m (197 ft) layer of silt.[86] About 70 mud volcanoes have been found in the area of the strait.[86] More than 7,000 piles support the bridges; these piles have been driven up to 90 m (300 ft) beneath the water surface.[86] Some of the piles are at an angle to make the structure more stable during earthquakes.[86] Some experts expressed doubts that the construction was safe, given the tectonic and sea current conditions in the strait.[86][87] [...] In November 2018, the area near the bridge became the site of the Kerch Strait incident, in which the Russian navy claimed that three Ukrainian vessels entered Russian territorial waters. Russian forces seized the vessels and arrested their crews. During this time, passage through the Strait was blocked by a large cargo ship, placed under the bridge to prevent passage of other craft.[134][135] In response, Ukraine declared martial law in some regions of the country for 30 days.[134] [...] - ^ "Kerch Strait bridge to be built ahead of schedule – deputy minister". ITAR–TASS. 19 March 2014. Archived from the original on 30 March 2014. Retrieved 22 March 2014.