“Historically, mariners have been know to follow a long line of ancient traditions, many
of these based on old superstitions. For instance, Neptune, the Roman god of the seas, was
believed to summon storms and cause shipwrecks. During ancient times, sailors attempted
to appease Neptune by performing rituals……….Centuries later, natives around the world would
adopt the tradition of crossing the line ceremonies. In the US Navy the ancient rituals have evolved
into the rites of passage for new and inexperienced sailors (known as pollywogs) who cross the Equator
for the first time, ultimately becoming initiated into the Order of the Shellbacks (experienced sailors).”
Source: Intrepid  Sea & Space Museum