Anchor Handling Tug Supply Vessel
![AHTS Normand Master alongside the Balder at Thunder Horse Oil FieldAHTS Balder Viking handling anchors for the Semi-submersible Platform Transocean ArcticExamples of AHTS vessels](/Images/godic/202412/20/Normand_Master2313.jpg")
![Two crewmen on Bow winch area](/Images/godic/202412/20/Balder_Viking_anchor_handling2313.JPG")
![ROV at work in an underwater oil and gas field. The ROV is operating a subsea torque spanner tool on a valve on the subsea structure.](/Images/godic/202412/20/ROV_working_on_a_subsea_structure2314.jpg")
Anchor Handling Tug Supply (AHTS) vessels are mainly built to handle anchors for oil rigs, tow them to location, anchor them up and, in a few cases, serve as an Emergency Response and Rescue Vessel (ERRV). They are also used to transport supplies to and from offshore drilling rigs.