This is great, Amitava. I was intrigued by the thumbnail, and surprised when I opened it up and read the description - I know this sub very well, the USS Torsk (I was raised in Balto & live nearby.) Yes, this is the "shark's mouth" painted on the bow of the boat.
A trememndous abstract - my son & I will be by the sub this Sunday, and I was thinking about how to photograph it, but this view never occrred to me. Congratulations.