Half a submarine just floated past.

Ok, I know it sounds odd, but I swear I just saw 1/2 of a Submarine go past the house on top of a barge.

I went to the AIS site and the barge is the:
Ship Name: C.ANGELO
Speed : 8
MMSI: 366988420
Course: 356.5
Ship Type: Tug
Heading: 511
Ship Lat: 38.6979
Ship Long: -76.451
Dimensions: L: 30
W: 10
Destination: RIVER HEAD
D: 3.4
ETA: Jan09 19:00
UPDATE: It might be the front bit that goes in below the waterline in front of a ship: