The #1 Paranormal News Site
This is a website I visit quite regularly (I love ships), and was very surprised to see them post something of this nature.
The craft was estimated to be five times the length of their tug (supply vessel), which is 240ft – so we're talking about it being between 300-400 metres. It apparently rose up out of the sea between their vessel and the rig, with no water appearing to run off of it. The craft hovered about 40ft over the water, and then took off at tremendous speed.
An amazing case from the sound of it. I'd love to see someone follow this up, and possibly interview the crew.