Analysis of the opening sequence of 'Shutter Island' (more to add from notes)

Shutter Island starts with titles in an old school font style which represents the theme of old school policing and detectives. The second part introduces us to the characters and the location of the plot, being Shutter Island, the creepy boat in the fog is the first thing we see representing the film's creepy and mysterious feel for it. The boat that emerges from the fog grabs the attention of the audience and creates suspense, making you wonder why is there and who is inside and you you are left unknown as to who is steering.
The single silhouette of the human figure looks ghostly in the fog. Then we hear the non diegetic sound of the fog horn with no returning fog horn sound which shows us as the audience, how isolated the ship is.
We are first introduced to the main character in the bathroom with his head down the toilette throwing up showing that he is flawed in someway. After we hear the non diegetic sounds of chains and shackles rattling around whilst showing them hang from the ceiling which adds a strong sinister feel to it and you know that the film contains something to do with prisons and or holding people hostage.
The introduction finishes when we're first shown the Shutter Island which is where the film is set. The island is shown as a large island but at this point is only shown as a dark, dangerous looking island. When we are first shown the island it is shown half dark and stormy and although the other side is dark looking, it is much lighter which may subtly suggest to the audience that the film is unbalanced and seems like the darker side is creeping over to the more pleasant side.