The invention encompasses fire-escape models of off-shore rigs with emphasis on a ‘Detachable Island Rig’ (DIR) instantly unlocked upon a rig-fire, from a permanent ‘under-water basement’, saving property and personnel. The devised ‘water-seal’ of its basement's ‘in-situ’ ‘fire-escape’ entry, not destroyed upon a rig-fire, serves as an exceptional model (named ‘Sumathi Paturu in-situ Model’, after its inventor) for an ‘in-site’ fire-escape with a similar ‘water-seal’ for jack-up rigs without a basement. An ‘off-site’ modular is an unlimited air-source for all ‘fire-escape’ units. A ‘spray-room’ with converging ‘spray-walks’, or ‘spray-tracks’ with ‘track-drives’ or a simpler means of ‘spray-drives’ are safe evacuation accessories workable even with minimal expendable cost and space. In the foregoing, vital needs like safe evacuation, food, and fresh air are devised as affirmed provisions, whereas the wheeled ‘life-boats’ and ‘lift-boats’ are
