1) If i had had my own yatch, I would have sailed it around the world.
2) If i had traveled to Phuket, i would have taken a scuba diving course.
3) If i had been surrounded by the big sharks, i would have stoped breathing.
4) If the divers had not passed the advance level of scuba diving, they would not have been able to dive that deep.
5) If the sharks had not finished their meal, they would have killed somebody.