And here we have an example of the illusions caused by compressing a 4 meg image down to at maximum of 102,000 bytes.
As Synergest [accurately] surmised, that indeed is a string. A string which is attached to a once waterproof clear bag whose purpose on this particular day was to keep my digital camera dry as we swam ashore from the charter boat. Upon reaching shore I discovered with horror that the eyelet where the string was attached was no longer sealed against water intrusion. Thus allowing mass quantities of salt water to surround the case in which my camera was stored. The camera