With Robson disappeared and now aware of the real threat, Harris assumes control of the command centre, calling in Megan Jones, Director of Euro Gas. The Doctor and his friends return to Harris's home, and find Mrs. Harris gone but the house filling up with sea foam, which they barely escape from through a skylight. They return to the centre and find Mrs. Harris hasn't been seen there either; despite his duties, Harris feels he must search for his wife, and leaves the chief engineer in charge. Out on the beach Mrs. Harris and Robson are watching the waves, and she tells him there isn't much time and he knows what he must do. Robson agrees, and Mrs. Harris walks out into the waves. Harris appears and questions Robson, who calmly tells him he'll see his wife soon, and then walks away down the beach.