Fuente: WIPO "rice" An underwater deployable and retractable reel to be used to deploy a delayed surface marker buoy that comprises of a reel mechanism 7, a trigger 3 and brake 4 mechanism, an operable compressed air cylinder 2, an air filling port 1 and a means of supplying air to an inflatable marker 5. The reel mechanism will preferably operate via a power/clock spring and may hold ten meters of safety line. The air cylinder will preferably be trigger operated and be pressured up to 232 bar/ 3200 psi. The brake mechanism can be locked off to stop the deployment or retraction of line at a decompression stop at a depth of five metres or fifteen feet.