So, dude, there is this remote-controlled ship, right. And it tows a rig with a hole in the center. In the center of the hole in the center there is a lightning-attracting rod, that is connected to the sides of the hole with rods (slinky, so that when the rig pitches in the sea, the rods slink, and adapt).
And there is this net – basically just cords strung together, so that sea-water can move freely through it. There are stainless-steel wires connected to this net. These stainless-steel wires are as large as possible, considering weight restrictions plus a standard resistance, so these two factors determine the Ampacity of the stainless-steel wire.
To protect the physical dimensions of the wire, after an initial part which is allowed to conduct the electricity in, the wire is insulated by PVC.
These wires are laid out, along the sea-bed, till they reach the nearest sea-shore.
They are connected via socket-plugs to another wire, which is a HVDC transmission wire. This ends in a power station, which can then convert the incoming direct-current to electricity of their required specification.
So where does the electricity source? There a storm somewhere in the sea nearby. So the remote-controlled (could get dangerous – lots of charge out there, but hey! Some people might like to be on that ship…) ship is sent into the storm.
The lightning-attracting rod is raised up. The clouds bang together, and lightning results. It follows the shortest path to the earth, in this case, the lightning-attracting rod that we have hopefully lifted up.
So the lightning traverses the rod and the rod is kept dipped in the water below, so the lightning continues on in.
Water is a good conductor of electricity, so the electric-charge from the lightning dissipates in the water.
And we have our stainless-steel-conducting wires sitting hopefully in the nets. So some of the electric-charge flows into them, depending on the resistance (which depends on the circumference of the wire, and the standardized specification which has been determined as the standard (I haven’t yet determined what that is – so basically, get a stainless-steel wire, as large as possible considering that the weight of it needs to be borne by the net / rig etc., round off the dimensions, so it is a nice round number, and whatever the resistance of that wire is, well, that is the standard resistance, so all the wires are made of this dimension).
So now we have current flowing in the wires, and that is electricity.
The electricity flows through the wires, to the sea-shore, where the wire is plugged into a socket that leads to a HVDC wire of the same specification, which is laid in the ground and covered with earth, and which transmits it to a power station.