This is a special Shell Promo set, and it is set #2 in the series. It is also the only set with Yellow diving flippers and that red printed piece. I bought it at Brickfest 2006, and am just opening it today :P
Contents of the box:
Left side with holder for the flippers:
Right side with holder for harpoon gun and a light:
Minifigure (I'm pretty sure this is the only set with a female diver):
Overall, I think this is a great little set. I'm not one for words, but if you ever happen to come across it, I suggest getting it, and I personally think it is the best Shell set in the series of small promo sets that they made.