Time Capsules of the 1939 and 1964 New York World's Fairs, intended to be opened 5,000 years after their creation. Prisoners from the Auschwitz concentration camp concealed bottles containing sketches and writings that were found after World War II. Certain emergency medical services urge patients to record information describing their medical conditions, medications and drug allergies, emergency contacts, as well as advance healthcare directives for when the patients are incapacitated or suffer from dementia or learning difficulties, and place the record as a special "message in a bottle" stored in (conventionally) a refrigerator, where paramedics can quickly locate it. Environmental issues Plastic bottles are known to constitute plastic marine pollution, and eventually break down into smaller pieces because of ultraviolet light, salt degradation or wave action. Glass bottles can break into sharp-edged pieces, and bottle caps are ingested by sea birds. Some agencies continue to use drift bottles into the 21st century, but with increased awareness that man-made floating items can harm marine life or constitute waste material, biodegradable drift cards and biodegradable wooden drifters with non-toxic ink are gaining favor. See also Beachcombing Drifter (floating device) Earth's black box Flotsam, jetsam, lagan, and derelict Friendly Floatees, plastic bath toys accidentally released in the Pacific in 1992 Ice rafting Swallow float Message in a Bottle (The Police song) (1979) Message in a Bottle (Nicholas Sparks novel) (1998) Message in a Bottle (film) (1999) Message in a Bottle (Taylor Swift song) (2021) References Publications Emergency communication History of communication Interstellar messages Letters (message) Maritime communication Physical oceanography