The two-day event (evening and day) is a ritual in which previously inducted crew members (Trusty Shellbacks), aka Seamen of the U.S. Navy, are organized into a "Court of Neptune" and induct the Slimy Pollywogs into "the mysteries of the Deep". Physical hardship, in keeping with the spirit of the initiation, is tolerated, and each Pollywog is expected to endure a standard initiation rite in order to become a Shellback. Depending on the Ocean or Fleet AOR, there can be variations in the rite. Some rites have discussed a role reversal as follows, but this is not always a normal feature, and may be dependent on whether a small number of Shellbacks exist to conduct the initiation.