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secret (underground) work;

the underground, Metro, tube, subway.

territory from which surface and underground waters flow into the given river or lake. B.w. is limited by watershed.

Public ground and underground transport for the carriage of passengers and luggage (bus, electric bus, trolleybus, tram, route and line taxis, subway)

the underground waters of atmospheric origin or formed and underlying within the earth crust (in the latter case they are confronted to juvenile waters).

method of water desaturation from the overwetted soils by removal of surface and underground waters with the help of special ditches and underground tubes – drains.