Burial at sea is the disposal of human remains in the ocean, normally from a ship, boat or aircraft. It is regularly performed by navies, and is done by private citizens in many countries.
Burial-at-sea services are conducted at many different locations and with many different customs, either by ship or by aircraft. Usually, either the captain of the ship or aircraft or a religious representative (of the deceased's religion or the state religion) performs the ceremony.
The ceremony may include burial in a casket, burial sewn in sailcloth, burial in an urn, or scattering of the cremated remains from a ship. Burial at sea by aircraft is only done with cremated remains. Other types of burial at sea include the mixing of the ashes with concrete and dropping the concrete block to form an artificial reef such as the Atlantis Reef.
Below is a list of religions that allow burial at sea, with some details of the burial.