Leon Marchand just SHATTERED the 400 IM World Record

What on earth did we just witness? Like the video for crying out loud. Leon Marchand just went 4:02.50 in the 400 IM and shattered a record that we thought was untouchable just a few years ago. At this point, who knows what could be to come for this sensational swimmer over the next week in Japan. Incredible. Subscribe to the channel for new swimming videos every week... Follow me on Instagram:   / kylesockwell   Follow me on Twitter:   / kylesockwell