Strange lines/base underwater?

Hi was just scrolling around and came across these? I did find more to go with this but these were the most interesting parts I reckon, I have no idea what they could be? 

Hey, ya dazza! Nothig serious, but better resolution strips of ocean bed surface. Some better, sonar survey (also check sonar) dataset amongst vast majority of low-resolution ocean bed surface imagery.

I saw you put this up both here and to Earth Browsing cathegory, so afterall feel free to delete that other one to keep forum clear and tidy! Thanks!

Waiting for other questions you might have about GE!

Best!

g

Thanks heaps on the fast reply thought it would have been days before I got answers, although what you saying sounds abit sketch I mean look at them.. But I will take your word for it and have a look at the links you provided. Again thanks