The St lawrence river is the longest inland seaway in the world. It took 350 years to transform it into the blue highway we now know. Within its history , the biggest marine industrial disaster in Canada occurred: the lost of the biggest drilling barge: the J.B. King. 78 years after the accident, Nathalie Lasselin put together a team of rebreather divers to rediscover this lost story. Confronting the depth and current, the team will go on a journey to identify the exploded wreck’s remains and hornor the memory of the men. In a split second, among the 42 on board, 30 lost their lives. The bodies of seventeen men were never recovered. Today the sole survivor Ev Snider recounts the fatal day.