The line-crossing ceremony is an initiation rite that commemorates a person's first crossing of the Equator. The tradition may have originated with ceremonies when passing headlands, and become a "folly" sanctioned as a boost to morale, or have been created as a test for seasoned sailors to ensure their new shipmates were capable of handling long, rough voyages. Equator-crossing ceremonies, typically featuring King Neptune, are common in the Navy and are also sometimes carried out for passengers' entertainment on civilian ocean liners and cruise ships. They are also performed in the merchant navy and aboard sail training ships.
The U.S. Navy and U.S. Coast Guard have well-established line-crossing rituals. Sailors who have already crossed the Equator are nicknamed Shellbacks, Trusty Shellbacks, Honorable Shellbacks, or Sons of Neptune. Those who have not crossed are nicknamed Pollywogs, or Slimy Pollywogs, or sometimes simply Slimy Wogs.
The two-day event (evening and day) is a ritual in which previously inducted crew members (Trusty Shellbacks) are organized into a "Court of Neptune" and induct the Slimy Pollywogs into "the mysteries of the Deep"
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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.[13] 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.
The transition flows from established order to the "controlled chaos" of the Pollywog Revolt, the beginnings of re-order in the initiation rite as the fewer but experienced enlisted crew converts the Wogs through physical tests, then back to, and thereby affirming, the pre-established order of officers and enlisted.
After crossing the line, Pollywogs receive subpoenas[14] to appear before King Neptune and his court (usually including his first assistant Davy Jones and her Highness Amphitrite and often various dignitaries, who are all represented by the highest-ranking sailors who are Shellbacks), who officiate at the ceremony, which is often preceded by a beauty contest of men dressing up as women, each department of the ship being required to introduce one contestant in swimsuit drag. Afterwards, some may be "interrogated" by King Neptune and his entourage, and the use of "truth serum" (hot sauce + after shave) and whole uncooked eggs put in the mouth. During the ceremony, the Pollywogs undergo a number of increasingly embarrassing ordeals (wearing clothing inside out and backwards; crawling on hands and knees on nonskid-coated decks; being swatted with short lengths of firehose; being locked in stocks & pillories and pelted with mushy fruit; being locked in a water coffin of salt-water and bright green sea dye [fluorescent sodium salt]; crawling through chutes or large tubs of rotting garbage; kissing the Royal Baby's belly coated with axle grease, hair chopping, etc.), largely for the entertainment of the Shellbacks.
In One Man’s War: Robert H Allison’s Life in the US Navy, we read more:
flashbak.com
The U.S. Navy and U.S. Coast Guard have well-established line-crossing rituals. Sailors who have already crossed the Equator are nicknamed Shellbacks, Trusty Shellbacks, Honorable Shellbacks, or Sons of Neptune. Those who have not crossed are nicknamed Pollywogs, or Slimy Pollywogs, or sometimes simply Slimy Wogs.
The two-day event (evening and day) is a ritual in which previously inducted crew members (Trusty Shellbacks) 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.[13] 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.
The transition flows from established order to the "controlled chaos" of the Pollywog Revolt, the beginnings of re-order in the initiation rite as the fewer but experienced enlisted crew converts the Wogs through physical tests, then back to, and thereby affirming, the pre-established order of officers and enlisted.
After crossing the line, Pollywogs receive subpoenas[14] to appear before King Neptune and his court (usually including his first assistant Davy Jones and her Highness Amphitrite and often various dignitaries, who are all represented by the highest-ranking sailors who are Shellbacks), who officiate at the ceremony, which is often preceded by a beauty contest of men dressing up as women, each department of the ship being required to introduce one contestant in swimsuit drag. Afterwards, some may be "interrogated" by King Neptune and his entourage, and the use of "truth serum" (hot sauce + after shave) and whole uncooked eggs put in the mouth. During the ceremony, the Pollywogs undergo a number of increasingly embarrassing ordeals (wearing clothing inside out and backwards; crawling on hands and knees on nonskid-coated decks; being swatted with short lengths of firehose; being locked in stocks & pillories and pelted with mushy fruit; being locked in a water coffin of salt-water and bright green sea dye [fluorescent sodium salt]; crawling through chutes or large tubs of rotting garbage; kissing the Royal Baby's belly coated with axle grease, hair chopping, etc.), largely for the entertainment of the Shellbacks.
In One Man’s War: Robert H Allison’s Life in the US Navy, we read more:
This initiation was the process of a “Pollywog” becoming a “Shellback”…
First you were forced to lie down on your stomach in a gutter of salt water and endure a… strapping across the butt with strips of canvas about two feet long soaked in salt water. From there, you were herded into the royal court where you were obligated to kneel before the “Royal Bar”, a metal rod that you had to grip with both hands and received a jolt of electricity that shook our eye teeth. Next, we had bow to King Neptune and his queen and then kiss the big fat belly of a big fat chief dressed in a diaper. This slob was the “Royal Baby”.


Crossing The Equator: When Shellbacks Became Pollywogs Aboard The USS Princeton (1957) - Flashbak
Shellbacks and Pollywogs ‘This set of slides were taken by an unknown Officer aboard the USS Princeton, CV-37, in 1957-58. The Princeton carried anti-submarine warfare airplanes,’ writes Doug Price. ‘This metal box of slides was sadly found in a clear-out of an abandoned storage locker, so I...



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