For this method, you must position the jet ski as in the video, i.e., the front towards the corner of the wall, taking care to leave a space.
Then get on the jet ski and slide on it looking towards the corner of the wall and voila!
FYI, the slide has the effect of moving the jet-ski forward, but as you will be faster, during your slide, you will fall in front of the jet-ski and it will push you into the angle so to get you through the wall.
Don't hesitate to start over if you mess up, get back on it, slide towards the sea ... like here 1:12 it will start again, then start again.
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