A prophecy from 1994 predicted disaster for Guam, specifically a tidal wave caused by an earthquake in Japan and a volcanic eruption. The discussion highlights that while earthquakes alone may not generate significant waves, landslides can create massive tsunamis. A notable example is a 1958 landslide in Alaska that generated a wave reaching 520 meters. The conversation also points to a potential threat from the Azores, where a fault structure could lead to a wave as high as 900 meters, capable of devastating the U.S. East Coast. This scenario is supported by a recent Science Channel program, which emphasizes that such events are not a matter of "if" but "when." The discussion further mentions the potential for megatsunamis from other locations, including the Canary Islands, which could cause significant coastal destruction in the future. Overall, the thread conveys a sense of urgency and inevitability regarding these natural disasters.