system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If an electricity line breaks under a river, how does the electricity company repair it?
gpt
With a spice kit.

The line is deenergized and divers will bring the cable up to surface and install a splice kit at the needed section.  If too deep (typically ocean repairs) remotely operated vehicles will make the repair by cutting the cable and bringing the ends up to the surface. If the river is small, they will cut the cable on dry land make the tie in there and run another cable to the other side and make the other tie in. No need for divers.

Edit: clarified some things. Still leaving spice kit though.