foundation. >> he put it into the crawlspace. stayed inside for a minute or something. then came out. and closed the gap. >> reporter: de jonge knew he witnessed something chgt . it wasn't until the news broke about natalee holloway he put the together. he said he couldn't go public. >> you have to understand, first the law could have punished me for things. but also the people i work with. you know they, they wouldn't be pleased. >> reporter: did you know who the man was? >> no. at that time not yet. but the days after this missing girl, this and that. then i heard joran, yeah. >> reporter: years went by. then in 2008, de jonge says he saw an interview by an undercover dutch journalism which van der sloot said nataeee holloway died when the two were together and her body dumped in the ocean. van der sloot said he made it