 So the next thing we're going to do is we're going to talk about directional drilling. As time progressed, these terrestrial oil fields were all accessed and in a sense being used up through the middle 20th century. Towards the later part of the 20th century, what the oil companies discovered was that they could move offshore. One of the big technological breakthroughs that allowed this to happen was directional drilling. It was one of those engineering breakthroughs that really had its origins in the U.S. And I don't know the person or the team that developed it, but I do know there were a lot of people that were trained up in this technique in Colorado. What it allowed you to do is set up one base drilling station and allowed you to put out a whole bunch of different wells from one rig as it were so that you could have all these oil wells coming into one platform. So that made it much, much more efficient, less expensive to develop these oil fields offshore. The other thing you could do is if you had islands offshore, you could actually set up your drilling platform on an island and then go horizontally out and then down kilometers away just by steering your drill bit.