I don't think so. It might've, but I don't think so.
No. Nobody has ever been to Neptune. Also, Neptune is a gas planet. There is no solid surface to dig a hole in.
No, the farthest planet from the Sun is always Neptune.
no
Voyager 2 flew by Neptune in 1989, coming within 30,000km of the planet.
Yes, probes have.
no
No I'm 90% sure!
No, nobody has speculated that there may be life on Neptune or any of its moons. The planet is just too far away from the Sun.
No, no human has ever set foot on Neptune or any other planet in our solar system besides Earth. Neptune is a gas giant with extreme conditions, making it impossible for humans to survive there.
Voyager 2, which flew by the giant planet in 1989.
No. Mars, Jupiter, Saturn, Uranus and Neptune are always further from the Sun then Earth is. Neptune is the furthest. (For Pluto fans, Pluto when it was regarded by the IAU as a planet was sometimes "furthest". But even then, it's orbit was so eccentric that sometimes Neptune was.)
No, only the moon has been stepped on by man, other than the earth.