Underwater archaeological investigations in Israel have recovered instruments intended to be operated under water from a vessel on the surface, at depths and times beyond the ability of free divers. Some of these remotely-operated devices, including salvaging-rings, coral-harvesting devices, and grapnels, are described, classified and discussed. These humble but efficient instruments, the prototypes of sophisticated modern instruments, fulfilled necessary tasks in antiquity and are still being used today by traditional fishermen. P eople belonging to coastal and maritime cultures carry out, almost daily, numerous activities on the sea-bed. Recognizing sea-bed features, and acting there, is essential for sailing, safe anchoring, fishing, salvaging of goods lost at sea, collecting sessile sea-life, and the building of marine structures. All these activities require reliable information on the sea-bed and working there for a long time, often in conditions exceeding the abilities of man. A land surveyor may easily obtain access to a given terrain and directly, by eye, acquire information without the use of special instruments. Obviously direct eye and hand contact with the sea-bed is the best means to study and work in this hostile environment. However, man's ability to do so is restricted by limited visibility and the short time which can be spent there. As a consequence, tools had to be designed to enhance the retrieval of information and the conduct of various activities on the sea-bed.The 20th and 21st centuries have seen rapid advances in electronics, materials science, and mechanics, which have enabled the design and manufacture of complex systems for obtaining information and operating in the extreme conditions of the bottom of the sea without the direct presence of man. These achievements, however, have their roots in the remote past. Archaeological discoveries on the sea-bed demonstrate that already in antiquity sea-going people designed and built remotelysensing or remotely-operated instruments to work under water. As early as the Bronze Age, depictions of ships include artefacts which may represent devices intended to perform such tasks (Figs 1 and 2) (Landstrom, 1970; Basch, 1987: 260-61, figs 563 -5). Figure 1. Ancient Cypriot mariners manipulating remotelyoperated objects from watercraft. (after Basch, 1987: 260 -61, figs 563-4)