Yeah, I just don't think that's realistic. If the cable is 100,000 km long and has a cross section of 1 square meter, it would weigh 122 million kg... if it were made of air. It would be almost a thousand times heavier if it was made of... water.

For 100,000 km cable to weigh "hundreds of tonnes", 1000 km should weigh tonnes and 1 km should weigh a few kilograms. I just cannot believe that will ever happen.

>This is still a lot of mass, because the cable is expected to be hundreds of tonnes.

Erm... maybe try billions of tonnes.

>To build it, we need a material whose specific strength is about 50 times higher than steel.

Ah, so it still has the same issues as it had 20 years ago. Ok then.