Ewww re: the Inferi in the cave

[Catlady (Rita Prince Winston)]

Judy wrote in http://groups.yahoo.com/group/the_ol
d_crowd/message/2625 :

<< By the way, although it would be nice if my theory were right, I
must confess that there is support for another, later, version of
Ewww, in which Pettigrew is the guy who wanted Lily. >>

And SO EWWW ITS IN THE SEWER, in which Voldie wanted Lily to bear him
a son, presumably because he'd heard a prophecy that Lily Potter's son
would win the war for his father's side.

Adan wrote in http://groups.yahoo.com/group/the_ol
d_crowd/message/2672 :

<< There were more inferi in that lake than just one small squad. And
there were women and children. Where did all these 'people' come
from? >> 

Since the Inferi are corpses, could he have Accio'ed all the corpses
in the sea, who were shipwrecked or washed away by floods or whatever?
When were those ro-ro ferry disasters?