 As the end credits come to the end, the music fades out and a rumble gets  louder and louder. This is the start of a shockwave resulting from the  massive explosion at the end of the film. The viewpoint is of Keanu Reeves  who by now is in a helicopter and comes straight on screen after the last of  the credits has gone up.  The ground implodes briefly and you hear Agent Ford  say "Whoa!".