The result was a powerful experience. Marcus Agrippa, second in command during the reign of Caesar Augustus, finally closed the shrine down, a few years before Virgil wrote the Aeneid . He had parts of the tunnel filled in with dirt. He cut down the sacred grove above, and used it for ship building. Charon, the boatman, takes on those who are buried.
Souls wander and flit about the bank for a hundred years.
Then Charon takes them o'er the water, they have so longed to cross. There's something beyond the old mythology here. I have not yet located this reference. I have looked at several versions of the Aeneid . You will find no lack of translations in your library or bookstore.