The Kraken Wakes recap

Radio journalists Mike and Phyllis Watson witness mysterious fiery objects descending into the ocean deeps. Scientist Bocker argues that they are extraterrestrial settlers adapted to pressures humans cannot endure. Governments dismiss or politicize the evidence until ships vanish and deep-sea exploration meets violent resistance. The invaders next send machines onto coasts to seize people, provoking a war fought at the edge of the sea. When coastal defenses improve, they melt the polar ice and raise global sea level. Nations minimize the forecast, prepare too late, and fragment as ports, farmland, and cities disappear. The Watsons retreat to high ground and later find London largely drowned. At humanity's weakest point, Japanese scientists devise a weapon effective against the invaders' abyssal settlements. The deep-ocean bases are destroyed, the water begins to recede, and the survivors start rebuilding a civilization transformed by flooding and social collapse.

English Broadcasting Corporation journalists Mike and Phyllis Watson witness luminous objects falling from the sky into deep ocean water. Similar reports accumulate around the world, but Cold War rivalry encourages governments to blame one another or suppress uncertain evidence. The objects consistently choose the deepest trenches, where human investigation is exceptionally difficult. Professor Bocker proposes that they are craft carrying beings whose natural conditions require immense pressure. Ships begin to disappear, and attempts to examine the seabed provoke destructive responses. The Watsons report the developing story as officials alternate between secrecy, reassurance, and military action. By the end of the first phase, the pattern can no longer be treated as an astronomical curiosity: an intelligence has established protected positions in the oceans, and humanity has entered a conflict it does not understand.

The deep-sea occupants begin direct attacks on land. Large machines emerge from the water, raid coastal settlements, and carry captured people back toward the sea. Their pressure-based technology makes them difficult to approach, while uncertainty about their bodies and aims prevents conventional diplomacy or intelligence gathering. Coastal communities are evacuated, defended, or abandoned as governments improvise weapons against the raiding machines. Mike and Phyllis cover the attacks and see public opinion move from disbelief to fear. Human forces eventually become more effective at stopping the shoreline raids, but Bocker warns that the conflict is not over. The invaders occupy a vast environment beyond easy retaliation and can change strategy. The apparent success at the coasts therefore marks only the end of one method of attack, not a human victory.

The invaders attack on a planetary scale by melting the polar ice. Bocker's projections show that the sea will cover ports, farmland, and major cities, yet authorities soften the warning and delay the disruptive preparations it requires. Water rises beyond early estimates. International trade and government weaken, refugees move inland, and disease and food shortages spread. Mike and Phyllis secure a place on high ground and survive as organized life contracts around defensible settlements. On a later reporting trip they travel through flooded London, where only upper floors and isolated structures remain occupied, and they nearly die before rescue. Humanity's position improves only when Japanese scientists develop a weapon capable of attacking the invaders in the deep trenches. Their settlements are destroyed, the rise of the oceans stops, and the water slowly begins to fall. The Watsons see recovery begin, though drowned land and collapsed institutions ensure that the prewar world cannot simply return.

Mike and Phyllis survive the inundation by establishing themselves on high ground, but a reporting journey into flooded London nearly kills them. They find the capital reduced to scattered occupied buildings linked by boats, with hunger, cold, and disease compounding the damage. After they are rescued, the long human retreat finally changes direction. Japanese researchers develop a weapon that can destroy the invaders' deep-ocean settlements, and coordinated attacks begin eliminating them. The seas cease rising and eventually start to withdraw, although enormous areas remain drowned and the old political and economic order has been broken. The Watsons live to see the beginning of recovery rather than a restoration of the world they knew. Humanity wins the military contest only after failing for years to recognize it, and survival depends on rebuilding within a permanently altered landscape.