The Lynx Mark 90B helicopter was undergoing limits testing when this landing was completed. Most of us probably have no idea how to land a helicopter on solid ground, let alone a helipad that is swaying in shifts of 30 degrees.
Whoever the pilot was, really deserves an award for making this landing on the ship. There are moments of suspense in the video where you think he will make the landing but at the last second the ship jolts in the wrong direction. In the end, the pilot has to just go for it, and touches down on the still rocking ship, safe and sound.