The Cave ROVer Project Update: Play Ball! The ROV Sediment Sampler is completed. Quick (4) stainless bolt attachment, maintains standard gripper functionality, while adding a 333ml scoop sampler, fabricated in hydrophobic, environmentally safe carbon reinforced materials. For use in environmental sediment research, marine vegetation and object retrieval, with an max expansion of 8.5 in. (21.5 cm).