Tether

You target a friendly or incapacitated creature you can see within range. A magical rope springs into existence and ties itself to both of you.

This magical rope will keep you and the tethered target no more than 30 feet apart and the target can be dragged or carried by you.

The rope can be destroyed with magical weapons, any amount of magical damage, 3 or more slashing damage from one attack, or broken with a successful Strength (Athletics) check (DC is your spell DC). This spell’s duration increases to 6 minutes when you reach 5th level, 9 minutes at 11th, and 12 minutes at 17th.

Credit- Dungeon Masters Guild: Underwater Campaign; Daniel Chivers