1)
Why did Hashem tell him to dig in the hole?
1.
Rashi: He should widen it.
2.
Radak: This is a sign that [due to the sin of idolatry,] the enemies will dig in the walls of Yerushalayim and breach them.
2)
What do we learn from "v'Hinei Pesach Echad"?
1.
Rashi: Via the hole, I saw the opening to a chamber.
2.
Radak (7): He widened it until it became an opening via which a person can enter.
3.
Malbim: It seemed to him that via his digging it became an opening.
