Ok this isn’t really very workshop related except one end of the conductors terminate in a Sub panel in my workshop

essentially I have a 6-2 or 6-3 direct burial cable running from the shop to a pump way down at the River. What I’d like to do is cut that cable about 50’ in and put a Sub panel outside. Is this doable? It seems like I’d have to have a good way to splice in a section since there’s no slack because I still want power down at the river as well as some additional branches Then I’m not sure how to handle grounding at the new sub panel.

thoughts?

it would be very tough to run a new set of conductors from the sub panel in the shop