The Duchess of Cambridge is now an advanced scuba diver.
A Kensington Palace official confirmed that Kate has built on her enjoyment for scuba diving by passing a Professional Association of Diving Instructors (PADI) advanced open water diver qualification. It means she can dive to a depth of 30 metres (98ft).
Enjoying the waters looks like it could be a family affair as the Duke of Cambridge is also an experienced diver.
William is now the third generation of the monarchy, after his father and grandfather, to head the British Sub-Aqua Club (BSAC).
When he took on the role as president of the BSAC , the UK governing body, William said he hoped that little Prince George would follow him by taking up snorkelling and scuba diving.
The Duchess is thought to have gained the qualification from a diving school in Mustique, according to The Telegraph.
There are five dives - including the must-do deep and underwater navigation dives - which have to be completed successfully in order to gain the advanced qualification.
The deep adventure dive is about the planning of dives, how to deal with the physiological effects and challenges of deeper scuba diving. The underwater navigation elements aims to fine tune compass navigation skills and helps you better navigate using kick-cycles, visual landmarks and time.
Photography, buoyancy control, fish identification and exploring wrecks are also part of the course.
BSAC chairman Eugene Farrell told The Telegraph: "We are thrilled that The Duchess of Cambridge shares her husband's interest in the underwater world and has further progressed her diver training."