When it became apparent that Dunn wasn't going to make it, one even said, "Oh, he just died" as the group laughs.
When Dunn's screams could be heard in the distance, the teens began laughing.
"Wow." You can even hear them say they won't save him, just before realizing that the man died.
Dunn's fiancee filed a missing persons report on July 12, and his body wasn't found for another two days.
Only after his body was discovered floating by the edge of the water in Bracco Pond Park in Cocoa, Florida, on July 14 did his family discover someone recorded his drowning and didn't help.
Martinez also said it was possible that police associations in Florida would push state legislators to re-create a law regulating the failure to render aid.
State Attorney Phil Archer released a statement saying, "we are deeply saddened and shocked at both the manner in which Mr. Dunn lost his life and the actions of the witnesses to this tragedy".
To help defray funeral expenses, Dunn's sister has set up a GoFundMe page. The ages 14 to 16-year-olds watch him struggle and ultimately fall under the water. They didn't call the police.
Police say that Dunn went to the pond after an argument with his fiancee that occurred about 10-15 minutes before the incident.
"You gotta understand", shouted the teens.
The youths were later identified and questions by detectives, who said they lacked remorse. Florida state law does not require people to give or call for help when someone is in distress.
"I want to think that's a natural instinct for any of us, that if we saw somebody in trouble or somebody having an issue, that we would at least try to get them help", Cantaloupe said.
When Dunn screams for help, the teens began laughing.
However, every USA state does have a "Good Samaritan" law, to protect people who render aid to someone in danger from being sued for anything they did in the course of their actions - although there are some exceptions.
Investigators have identified the teens and interviewed them.
They posted video of the incident on YouTube and did not alert authorities.
"Everyone is just horrified by this", Martinez said.
The Cocoa Police Department called the video "disturbing", but the Brevard County State Attorney's Office said the teens can not be prosecuted under state law, notes FLORIDA TODAY.