An attorney for the family of Nolan Wells said Thursday that they have hired audio engineers to review a distress call made from a boat on the day of his disappearance, which has prompted online speculation and claims of defamation amid the ongoing investigation into the 18-year-old’s death. The recording, released by Mississippi authorities this week, captures a July 4 call to a private marine towing company requesting assistance for a boat that was taking in water off Horn Island, where Wells was last seen. “Our bilge pump stopped working. We’re sinking. Can y’all please come?” the caller asks, noting that there were about seven people on board. The dispatcher then speaks with a captain for the towing company, who said a relative of the boat owner reported those onboard had solved the issue and “don’t need any help right now.”The distress call was made to Sea Tow, a private company, and released to media outlets by the Mississippi Department of Marine Resources. Law enforcement officials have said they were told by witnesses that Wells was not on the boat when it left the island.

Speaking at the National Urban League Conference on Thursday, the civil rights attorney Ben Crump said Wells’ family had retained audio engineering experts to review the recording. The legal team is also calling on prosecutors to include outside authorities in the review of phones belonging to friends who traveled with Wells to the island.A voicemail left with the Jackson County District Attorney’s office was not returned.Wells’ parents also attended the conference, pleading for anyone with information to come forward. “We will not rest until we get answers,” said his mother, Christine Wonsley.