Mother and pre-teen son witness a silver disc crash into Penobscot Bay.

Telephoned Report:  A man calls to report having witnessed a large, silver disc flying into, or perhaps crashing into, Penobscot Bay near Camden, Maine, during the late 1950’s.
The witness reported that he was a pre-teen at the time.  He and his mother were looking at the ocean, when they both suddenly witnessed a large, silver, disc-shaped object suddenly appear in the eastern sky, and fly very fast from east to west at a shallow angle of descent.  It then struck the water in Penobscot Bay, disappearing from their sight.
The witness reports that his mother told him to never talk about the event.  He finally decided to report the alleged sighting in 2006.
 Witness elects to not submit a written report.
We spoke with this witness via telephone, and he sounded quite serious-minded and credible to us.  He became annoyed at me over the telephone, and stated that he did not wish to submit a follow-up written report.  PD