The boat's radio room has detected signals from the area of the last sighting. These signals are highly regular in keeping with the designation of beacon and I assume they are intended as a form of locator device in a recovery situation. The average depth of the arctic basin is well beyond the operating depth of this boat, however triangulating the signal over the last forty eight hours we believe that the beacon is in shallower water lying over the Lomonosov ridge. It is likely that the Leninsky Komsomo, a November class boat, can operate at greater depths than us, but we have the edge on speed and probably on detectors so we may be able to recover the beacon before they arrive. At this time of year sea ice cover means that our direct route to the ridge will take us under the ice through shallow water. The journey will stress the crew so we need to minimise the distance travelled. We will continue to monitor the signal. Any information you can give us about location will be greatly appreciated.