Union Minister Ashwini Vaishnaw visited the Hyperloop testing facility at IIT Madras on Saturday and said that the Hyperloop tube, being developed with the help of the Indian Institute of Technology Madras, will soon be the worlds longest tube, measuring 410 meters in length.The 410-meter-long Hyperloop test tube located at IIT Chennai is already the longest Hyperloop test facility in Asia. Hyperloop is a high-speed train that runs in a vacuum in a tube.