tubers

so i was on the lake today enjoying the calm water with my friends and i was about to jump out into the water, when a boat roared past me maybe 20ft away from us (there was plenty of water to go around plus there tubing so its not that hard to turn) and i was yelling at them to watch out for my rope but it was to late they ran right over it and cut in half and my handle doesnt float so i lost that too. So i went over to them and told them that they shouldn't drive so close to other boats especially with people about to jump in the water so they gave me all the money they had on there boat $25 to pay for the handle and the rope. So i went and bought a new handle but i think i can save the rope with extentions, anyone know how to fix a cut rope?