His brother Chris Morvillowho was among seven people who died when a named superyacht Bayesian sink in August, speaks in a new interview about the tragedy that occurred off the coast of Italy.

In an exclusive clip from IMPACT x Nightline’s Gone In 16 Minutes: Sinking of The SuperyachtGreg Morvillo says he “broke down” in tears after hearing in a phone call that his brother had died on Monday, August 19.

During the interview, which will air exclusively on Hulu starting Thursday, November 14, Greg reveals that he “can’t stop thinking” what the final moments were like for the seven victims.

“I think about their last moments on the ship all the time,” says Greg. “It’s haunting. It’s terrifying.”

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He adds: “I can’t imagine what they were going through. I can’t imagine how he felt or what they knew. It’s impossible to wrap my mind around it. But I can’t stop thinking about it.”

Chris was the British tech entrepreneur’s lawyer Mike Lynchwho also died after the superyacht capsized. Mike’s 18-year-old daughter also died, as did Chris’ wife, Neda.

A source close to the survivors previously confirmed to PEOPLE that Mike celebrates his fraud acquittal on the yacht when it sank. Chris represented Lynch in the lengthy legal saga in the United States, which dates back to 2011.

Ed O’Callaghan, a former Justice Department official and close friend of the lawyer, previously told PEOPLE that Chris hoped to spend time with his wife and their two adult daughters, Sabrina and Sophia Morvillo.

“He missed a lot,” O’Callaghan said at the time. “It was just buried in preparing the defense for Lynch. And I think he really believed that the near future was going to be a lot of wonderful family time.”

In the new episode of IMPACT x NightlineGreg claims he knew in his heart that a call about his brother’s death was coming after he learned the yacht had capsized. However, he was devastated when the news was confirmed.

“I hung up and broke down,” Greg recalls. “Piant is the only way I can describe it. It was awful.”

Also interviewed for the episode are numerous people who were close to Mike and his family, including two of his daughter Hannah’s friends, Marko Kresojevic and Benedict Macklow-Smith.

Captain Glenn Shephard, sailing yacht captain and Bravo reality series star Sailing yacht below deck, The Sunday Times correspondent Danny Fortson and more are featured in the episode, hosted by The night line co-anchor Juju Chang as well.

IMPACT x Nightline’s Gone In 16 Minutes: Sinking of The Superyacht premieres Thursday, November 14, exclusively on Hulu.