Question

which is the longest underwater pipeline in the world​

Answer 1

Answer:

Pipelay activities were completed on Line 1 in June, making Nord Stream the longest subsea pipeline in the world, surpassing the recently completed Ormen Lange gas pipeline (which runs about 725 mi, or 1,167 km, in the North Sea).

Answer 2

Nord Stream

Explanation:

which runs about 725 mi, or 1,167 km