Just back from the red sea and found this thing.  Saw one twice.  Not seen one before, the guides havent either and do not know what it is.  Just wondering if anyone here knows.

It was perhaps a meter or so long, kind of an inch or so thick almost a square shape I would say with balls on each corner of the square, and as the picture shows largely clear except 2 yellow lines running down its body with strange almost floral tenticals at one end.  The other end no idea as couldnt find the other end, it was hidden in the coral.

Both tims found on a night dive.