Abstract: A seabed anchor (20) is fixed to and deployable from an ROV (10) for positively anchoring the ROV (10) to the seabed (100). The seabed anchor (20) comprises three nested telescoping tubes (26, 28, & 30). The upper end of the outermost tube (26) is fixed to the ROV (10). A rotary drill bit (38) is carried on the output shaft of a motor (34) that is mounted on the lower end of the innermost tube (30). The nested assembly of three telescopic tubes (26, 28, 30) can be controllably extended and retracted by controlled operation of a hydraulic ram or other linear actuator coupled between the outer tube (26) and the inner tube (30). Each of the tubes (26, 28 & 30) carries a respective one or two pairs of inflatable packets (40, 42, & 44) that are normally uninflated and lie quiescent within respective recesses in the sides of the tubes where the packers do not interfere with telescopic relative movements of the tubes.