This is the well hidden second Tbolt 1003 on the south side of the city of Sarnia, Ontario. Looks to be extremely low mounted. There is a second Tbolt about 1/2 mile+ to the west of this siren that ELP recorded from Marysville, MI. The plant normally runs an alert signal after attackl, so either they didn't do a full test this run or the cameraman stopped recording.
You can also hear either EOWS 1212's or Modulators near the end of the recording.
New video recorded from the Aamjiwnaang Nation: http://www.youtube.com/watch?v=8Tc6oXNcjxc
ELP1998p71's video: https://www.youtube.com/watch?v=_kpvjiVe6Ds