When we were at South Stack this helicopter came swooping past and you can see the wheels. Look at the people in there, luckily no one dround, they were just practising.
The bits that make it fly are making a mist be blowing the water up in the air.
We were in North Wales so there could be a chance that it is Prince William flying the helicopter and look at the silly legs flopping about.
I am going to explain how the waves are crashing in the picture below. The wind is blowing it one way from out to sea and then another wind is blowing another way round the lighthouse rock at South Stack. The wind blowing two different ways makes these waves crash together.