Rate the following argument fragment on its writing, argument, and language skills:
Evidence: They were all unmanned because the pressure and heat of the planet would instantly kill the occupants inside the ship. Even without anyone in the ships, the spaceships were still crushed by the pressure of the planet. He states that "no spacecraft survived the landing for more than a few hours". He then goes on to say that this is probably why no spaceships have touched the planet fr three decades.

Score: 1