Walker said Okene couldn't have lasted much longer.
"He was incredibly lucky he was in an air pocket but he would have had a limited time (before) ... he wouldn't be able to breath anymore."
The full video of the rescue captured by divers was released by DCN Diving after a request from The Associated Press. Initially, a shorter version of the rescue emerged on the Internet. The authenticity of the video was confirmed through conversations with DCN employees in the Netherlands. The video showing Okene was also consistent with additional photos of him on the rescue ship. The AP also contacted Okene on Tuesday who confirmed the events.
Okene's ordeal began around 4:30 a.m. on May 26. Always an early riser, he was in the toilet when the tug, one of three towing an oil tanker in Nigeria's oil-rich Delta waters, gave a sudden lurch and then keeled over.
"I was dazed and everywhere was dark as I was thrown from one end of the small cubicle to another," Okene said in an exclusive interview after his rescue with Nigeria's Nation newspaper.
He groped his way out of the toilet and tried to find a vent, propping doors open as he moved on. He discovered some tools and a life vest with two flashlights, which he stuffed into his shorts.
When he found a cabin of the sunken vessel that felt safe, he began the long wait, getting colder and colder as he played back a mental tape of his life — remembering his mother, friends, mostly the woman he'd married five years before with whom he hadn't yet fathered a child.
He worried about his colleagues — 10 Nigerians and the Ukrainian captain including four young cadets from Nigeria's Maritime Academy. They would have locked themselves into their cabins, standard procedure in an area stalked by pirates.