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It's pretty significant. it's pretty exciting. there haven't been that many ships found in manhattan. you know, it was something that occasionally -- ships were occasionally used as part of landfilling so it probably was part of filling in this land. so it's not unheard of. >> reporter: because of the history here, archaeologists have been monitoring the construction site. the wildlife conservation society shows just how much of lower manhattan was under water hundreds of years ago in a project. compare that to now. >> mostly it just tells us about the landfill structure of this particular are...

The wildlife conservation society shows just how much of lower manhattan was underwater hundreds of years ago. compare that to know. >> tells us about the landfill structure and how they were reusing things like old boats to build up the land because the shore line was originally about a block that way. >> reporter: this was the hudson river. >> yeah. >> reporter: this is just south of where the world trade center towers once stood, this rare relic hid gone more than 200 years. >> this is the kind of thing that archaeologists are hoping to find and very rarely do. >> reporter: mary snow, cnn, ...

It's not unheard of. >> reporter: because of the history here, archaeologists have been monitoring the construction site. the wildlife conservation society shows just how much of lower manhattan was under water hundreds of years ago in its project. compare that to now. >> mostly it just tells us about the landfill structure of this particular area and how they were reusing things like old boats to build out the land. the shoreline was originally at again niche street, about a block that way. >> reporter: where we're standing right now was just the hudson river? >> the hudson river, yeah. >> re...

Ocean-going vessel. probably at some time in the 1700s. heavily built. very solid frames close together. >> reporter: one misry, the circular structure. and anchor also recovered. how significant is this find? >> i think it remains to be seen what this ship really is, but it's pretty significant and exciting. there haven't been that many ships found in manhattan. you know, it was something that occasionally ships are occasionally used it's a past of landfilling. so it probably was part of filling in this land. so it's not unheard of. >> reporter: because of the history here, archeologists have...

History here, archaeologists have been monitoring the construction site. the wildlife conservation society shows just how much of lower manhattan was under water hundreds of years ago. compare that to now. >> mostly it just tells us about the landfill structure of this particular area and how they were reusing things like old boats to build out the land because the shorelines was originally at greenwich street about a block that way. >> reporter: where we're standing now at one point was just the hudson river. >> hudson river. yeah. >> reporter: this site is just south of where the world trade...