Abstract: Safety device for quickly locating a drowning victim underwater which essentially includes a hollow cap member open at one end, a threaded spool inside the cap member and containing a water-soluble marking dye, a solid, water-soluble closure member which fits over the cap open end and is adhered to the cap member and may also be adhered to one end of the spool, and a safety pin or similar member to attach the device to a potential drowning victim, the free end of the thread extending outwardly from the cap member with its free end tied to the safety pin or other attaching member which in turn is joined to one of said cap and closure members.

Abstract: Apparatus for visually indicating the position of a downed aircraft to rescue personnel. A bright yellow or lime-like in color substance is stored in at least one pressurized tank during flight, and means are provided whereby said substance is expelled from said aircraft responsive to separation of the craft's wings from the craft's fuselage, to operator-initiated control signals, or responsive to signals from a timing device.Rupturable substance-containing or substance-transmitting lines disposed in fluid communication with said tank or tanks, extend at least in part from the fuselage to the wings so that removal of a wing automatically causes the expulsion of at least a portion of the substance.The storage tanks are preferably chambered so that such line rupture allows only one chamber of such tank or tanks to empty, so that the remaining substance-containing chamber may be emptied responsive to operator-initiated signals or to timing device signals.