To stand a chance of finishing the race in a decent time the crew of the Omani yacht decided to try and move one of the working foils on the portside of the vessel to replace the broken one on the starboard side.
The incident started at about 21:30 GMT on Sunday when the 70m (230ft) tug slowed to check a problem with the tow and was struck on the portside by the Moto Vessel Emsstrom.