It's one thing to be left in the ocean by your dive boat
treading water with no land in sight, like the cautionary
  Open Water tale of Tom and Eileen Lonergan. It's quite
another when you're on a snorkeling trip and the boats
are never far from shore. But Ian Cole, a tourist from
Michigan who visited Australia this summer, doesn't see
the difference - - and he told his "harrowing" tale to multiple
media outlets.
While snorkeling Michaelmas Bay near Cairns in late
  June, Cole lifted his head out of the water and realized his
  boat, Passions of Paradise, had left without him. He told the
  Cairns Post that he panicked at first, taking in water through
  his snorkel. "But I was able to calm myself a bit, because
  there was another boat still out there, and I made my way
  to that vessel. Lucky it was there because, otherwise, I might
  have drowned. I did not handle the situation well, and I was
  tired." The people on the boat told him Passions of Paradise had left 15 minutes prior, and radioed for the boat to come
  back. Apparently, the person responsible for checking off
  Cole's name on the manifest had mistakenly done so without
  seeing him get back aboard.
Cole demanded an apology and a change of procedure
from the company so it does not happen again. Instead, he
received a form letter with a $200 gift certificate for fine dining
and wines. "I thought that was such an insult," Cole later
told Chicago's ABC news affiliate. "I actually went to the
mayor and asked if she could give it to a local aboriginal family
and make sure it got put to good use."
While it's not good to leave your passengers behind,
  Cole wouldn't be the first diver or snorkeler who had to
  make an easy swim to shore. (I've seen it myself off of Little
  Cayman.) That's why Col McKenzie, executive officer of the
  Association of Marine Park Tourism Operators, says Cole is
  making a mountain out of a molehill. He told CairnsBlog.net
  that the tour operator fired the employee who bungled the
  headcount, but Cole was never at any risk. With other boats
  and the shoreline close by, his ordeal was no worse than
  "being left behind at a beach." "The fact that this guy talked
  about this shows he's just seeking self-exposure, and wants to
  be portrayed as a hero, a survivor," McKenzie said.
But with Open Water drilled into so many Americans'
  heads when they hear about divers and the Great Barrier
  Reef, there remains no excuse for a boat crew failing a headcount
  and leaving a snorkeler behind - - even if he can kick to
  the next boat or to shore.
- - Ben Davison