すすんだそうだ
horisusunda sōda

Godan Verb (mu)
Evidential Auxiliary

Expresses hearsay about a past event ("I heard that...") of 掘り進む

1. It seems...; Apparently...; I heard that (they) delved into...; I heard that (they) progressed with...

Past/Perfective
Hearsay Evidence