I'm scared there might be a shark in the swimming pool

I have a shark phobia and, at the same time, a strange fascination with them. I have a feeling it all began when I watched Deep Blue Sea - terrifying. In my second year of university, I watched a Channel 5 programme called Shark Attack - Live! which was on every night for a week. That programme showed not only a ton of shark attack footage, but also explained how they eat you (either they grab you and shake you to death, or they pick off your limbs one by one - either way, pretty scary). As a result, I am very cautious about swimming in the sea and won't go deeper that shoulder height - a rule I also impose on Bruce.

Clearly, this might be an issue in Bermuda, but I'm pretty sure I read somewhere that there hasn't been a shark attack off Bermuda in the past 50 years. Now that should set my mind at rest... except...

• Speaking to Bruce's boss about my shark fears, he reassuringly informed me that he has been on the island for more than 10 years, and has only seen a shark ONCE. Bruce immediately told him that my reaction would have been much better if he had just said he had never seen a shark.
• At the Bermuda Underwater Exploration Institute, one of the exhibits allows you to experience a shark attack. Why on earth would anyone want to do that?
• The supermarket's website includes a link to Lindos Shark Tracker... it turns out they sponsored a tiger shark being tracked, along with a load of other Bermudian companies... argh! According to Wikipedia, "the tiger shark is responsible for a large percentage of fatal attacks and is regarded as one of the most dangerous shark species". Plus, in Hawaii, these sharks have been seen in water as shallow as 10 feet.

So I think my fear of the sharks lurking in the sea waiting to eat me is totally justified. But for some reason, Bruce thinks it is completely ridiculous that I am a bit scared there's a shark in our swimming pool...

... that is not as stupid as it sounds. Our swimming pool is painted black rather than blue, so when you are in it, it is basically as though you are just swimming in inky black water (i.e. the sea at night) and who knows what is hiding in there! Also, it's quite deep so I can't actually put my feet on the bottom...