Ukraine's military building fortified bunkers and trenches near Mariupol

Ukrainian soldiers have set military bunkers, designed by volunteers, near the south-eastern city of Mariupol, which is near the front lines of the conflict.These shelters are completely handmade. Volunteers from Kyiv made sketches of comfortable and secure fortifications while soldiers built them. One module can hold up to three divisions. It can even be outfitted with an antitank mine.
The creators offered their sketches to the Ministry of Defense of Ukraine, but were refused because building such bunkers costs almost USD 5,000 each. Three fortifications are ready for use, while volunteers are trying to raise money to consruct more.