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The efficient use of resources and environmental safety observed for the construction and operation of pipeline underwater crossings are still as relevant as ever. The paper presents investigations of the existing trenchless pipeline technologies and their design for underwater crossings. The methodology is suggested for calculating the well path for the promising design of inverted syphon welded by separate pipes above ground. Variants calculations are given for curved pipelines having the diameters between 530 and 1420 mm for underwater crossings with the width ranging from 30 to 230 meters.