Lots of fun facts on the Wikipedia page: https://en.wikipedia.org/wiki/Viking_Link > Annual transmission capacity of 12.3 TWh. > The actual cable is made of copper, steel, paper and plastic and weighs about 40 kg per meter. > It is similar in capacity and length to the UK–Norway North Sea Link.
> weighs about 40 kg per meter For reference, a human child weighs about 15 kg per meter. But since humans grow in 3 dimensions, a healthy adult human will be around 40–45 kg per meter, similar to the cable. In our current overweight society, realistic adult humans are of course heavier.
What’s the cost difference in using people vs cable? If we make the assumption that people can be bought at insurance rates and have equal capacity to a cable.