Feel like using your scuba skills for something lucrative?
Forget searching for treasure in sunken ships.
Diving for golf balls is where the real money is. With
an estimated 300 million of the wayward golf balls
lost in the U.S. alone each year, serious money can be
made from their recovery -- if you're willing to take the
plunge. Imagine swimming in a milkshake of silt. Now
add weeds, broken bottles and every type of critter from
leeches, to water snakes, even crocodiles, and you've
pretty much got the idea of the perils of golf-ball diving.
Sam Harrison, a golf-ball hunter based in London,
  England, says in the U.K., there's an average of 5,000
  golf balls in every lake. Harrison, 22, has a day job as a
  banker, but he also co-founded the company Lake Ball
  Diving. "Say we're selling the balls we find at an average
  75 cents," he recently told CNN. "That would give
  $3,700 per lake." He estimates that he could earn up to
  $150,000 a year.
In the U.S., Paul Lovelace, who has been diving for
  "white gold" over the past three decades, previously
  worked as a search-and-recovery diver on offshore
  oilrigs before founding Golf Ball Paul's in Kansas City,
  KS. Lovelace, 54, says the most prized catch of all is the Titleist Pro V1, which can retail for $2 per ball. However,
  there are significant costs before he hits the water, and
  golf courses charge divers between seven and 10 cents
  per ball they find.
Then there are the hazards. Once in the water,
  you're lucky to see more than a foot in front of you,
  and Lovelace has one piece of advice for new divers:
  "If you're grabbing stuff down there and it's not round
  -- don't pick it up! In the Midwest, we have snapping
  turtles, and they can take off fingers and hands and toes
  and other extremities if you're not careful."
It goes beyond just snapping turtles. Last year,
  Jacques van der Sandt, 29, was killed by a crocodile
  while retrieving golf balls from a national park in South
  Africa. Steve Martinez, 51, was bitten by an alligator
  while diving at a Florida country club. In the UK,
  Harrison has to face water snakes, but he worries more
  about the water itself. "On some courses, the lakes are
  more like sewers. In those stagnant pools, you can catch
  diseases, so you have to wear a head guard so nothing
  can get on you."
Harrison says he'd much rather be diving in the Red
  Sea. "I'd rather be seeing some picturesque fish than
  broken beer bottles. But overall, I enjoy it. And you
  never know when you might find a lake where you hit
  the jackpot."