How did Harry Potter 7 find the sword

The Gryffindor sword in Harry Potter 7 was found by Harry Potter and Hermione in a lake in the wild.

In Harry Potter 7, Harry Potter and his friends fled to a forest while avoiding Voldemort's minions. Because of the temptation of hanging a pendant, their friends have emotional problems, and Ron has left, leaving only Harry Potter and Hermione. One night, Harry Potter seems to have found the Gryffindor sword in the frozen lake of the forest under Snape's guidance.

The characteristics of Gryffindor sword:

Legend has it that the maker of this sword is a demon, ragnar I. In the wizard world, fairies are the best and most skilled in metalworking. Goblin ragnar was a very good silversmith at that time, and he was also the king of goblin clan.

Wizards carry swords with them when confronting ordinary people. The Gryffindor sword will respond to the wizard's request with Gryffindor quality, and sorting hat transferred the sword from anywhere through a similar call.