The invention relates to the field of special purpose robotic systems to conduct external functions such as cleaning, monitoring and inspection of structures such as tubular assets in a splash zone. The splash zone is defined as the section of a marine structure that is periodically in and out of water due to the action of waves or tides, usually falling within (+)10m to (-)20m water depth. In embodiments, splash zone inspection robot system (1) comprises station (300), submersible saddle (350), submersible robot (400), and subsea robot controller (308). A predetermined set of controllable clamps selectively secure submersible robot (400) to submersible saddle (350) or structure (2) and allow incremental traversal along submersible saddle (350) or structure (2).