Seems doable to be honest—huge spools of undersea cables are deployed on ships all the time. A spool 20 feet wide has a circumference of ~60 feet, and 3 miles

Seems doable to be honest—huge spools of undersea cables are deployed on ships all the time. A spool 20 feet wide has a circumference of ~60 feet, and 3 miles of cable is ~15,000 feet, so 250 loops around the spool. Seems doable.