Mars calling Earth: “what is all that blue stuff?”
If an alien spacecraft made an emergency landing on earth, then managed to repair itself and return to its home planet, it is very likely that it would report earth's environment as cold, dark, bleak and highly pressurised.
This is because, with the deep sea covering some 64% of our planet and average depths of 3,800 metres, there would be a very strong probability that our alien would have landed deep beneath the ocean's…