It starts off with gentle music, slow paced, the camera is showing us people having fun. Navy people going onto a boat. The editing is slow paced. The titles are appearing during the clip instead of on a blank screen in the beginning.
For the first 3 minutes everything is slow paced, music, camera, editing. Then we see a little girl drop her doll in the water, after this everything becomes fast. We hear a band playing music, then on the radio the beach boys song comes on "Don't Worry Baby", this relaxes the audience. Makes them feel reassured.
Everything seems to be like a normal day, people having fun enjoying themselves. But then the man looks into the mirror, we see the camera look inside and sees what seems to be a bomb. We then hear the beeping of it as it's about to explode. Then the editing shows us a wide shot of the boat exploding. It changes angles every second showing us a different angle of the explosion.