Nightly News | September 28, 2012
>>> it is one of the most famous and enduring american mysteries, what happened to jimmy hoffa , the teamster's boss who went missing without a trace in 19 # 5. well, now investigators are back on the case just outside detroit. and nbc's john yang is there.
>> reporter: could these six-foot cylinders with dark, muddy water , six feet in diameter, hold the answer to the mystery of jimmy hoffa ? this man said he saw the body buried years ago, and where ground-penetrating radar showed something, two feet deep.
>> we're just doing our job, we had credible information and had to follow through with it.
>> reporter: police said when he disappeared in 1975 , there was a different shed, the floor was dirt, covered with concrete. it is about 20 miles from where hoffa was last seen, apparently lured by two mob figures, since then, he has been famous, and his organized crime ties and federal court convictions in the '60s. jack nicoleson portrayed him in the 1992 movie, hoffa .
>> he was a real enemy of american society and a real threat to this country.
>> reporter: legends also surround his death, some saying his final resting place has been a giant stadium in new jersey, or detroit's center.
>> the stories are huge.
>> reporter: and so is the search, in 2003 , investigators dug under a swimming pool in northern michigan , in 2004 , they ripped up the floor of a detroit house . and in 2006 , they tore down a michigan horse barn. each time, they found nothing. investigators hope they will know next week whether the 37-year search for hoffa could finally be over. john yang , nbc news, roseville, michigan.