light speed = more mass

the closer you travel to light speed, your mass increases. how could we manage surviving this effect with current technology?

Well, we can survive it because it's only relative mass. We aren't ACTUALLY increasing in mass - but for purposes of energy requirements, we APPEAR to gain more mass. That's the best way I can describe it. It's not that it actually is, it just seems to from the perspective of energy requirements.

So don't worry - accelerating to near light-speed won't make you collapse into a black hole.

it also is linked with Time and length dialation.

Tho nothing is realyl changing it is the perception of if from an external observational point that is changing