I believe the chief of defence intelligence had this conversation with you, as well, a few weeks back. We maintain our understanding of where subsurface capabilities are in the world. We do that with our own sensors and with partners. We benefit from contributing to, and deriving from that partnership an understanding of where subsurface capabilities may be around the world.
That's about as specific as I can be. It's a highly compartmentalized, necessarily classified, capability and activity.