[lafroste]

Okay:

The article says it weighs 18,000 lbs. 1 gallon of water weighs 7.49 lbs. So it would have neutral bouyancy if it occupied 2,043 gallons, or 288 cubic feet. So, if it were 30 feet long, it would have an average diameter of 3.49 feet.

Big, but not THAT big...

[umbra]

Big enough to bring down a T-Rex?

[ArGee]

Thanks for the real math.

It's nice to have someone who is willing to fill in the gaps (rather large) in my knowledge. In this case, the volume of a gallon of water in other units.

Shalom.