The Duchess of Cambridge is now officially an advanced scuba diver. This means that she can now join her husband as he snorkels in deep waters. Prince William and Kate Middleton are supposedly very competitive when it comes to sports.

Having passed the Professional Association of Diving Instructors Advanced Open Water Diver qualification, Kate Middleton "can now scuba dive to a depth of 30 meters or 98 feet", reported E!.

This qualification enables Kate to join her husband on his regular scuba diving trips in Mustique, where he goes to find sharks. According to HELLO! Magazine, the duchess is said to have gained her qualification from a private school in the Caribbean,

Kelly Fisher, a friend of Prince William and Duchess Kate told The Telegraph, "We went diving and they went very deep, more than 90ft. Our instructor said Martin and I weren't qualified to go on the shark dives that they went on. They're quite the sportsmen."

According to The Telegraph, the mother of two had to complete five dives, "Including a deep dive and an underwater navigation dive, during which they are taught how to cope with the physiological effects of deeper scuba diving. Compulsory equipment includes a dive knife – used in emergencies such as becoming entangled in fishing nets - and a compass."

As Kate is qualified to accompany her husband, it seems the prince is keen on inspiring his kids to take up snorkeling and scuba diving. "'I hope that one day my son, George, will also experience the wonders that snorkelling and scuba diving have to offer. At the moment, bath time is quite painful. But, hopefully donning a snorkel and mask might calm him down," HELLO! Magazine quoted him as saying.