Will Japan be submerged by the Pacific Ocean?

No, Japan will not be submerged by the Pacific Ocean.

Although Japan is an island nation, frequently experiencing earthquakes and tsunamis, which might sound quite dangerous, it's highly unlikely for the entire country to be completely submerged by the sea. Global sea levels are indeed rising slowly, primarily due to global warming and melting glaciers, but this process is very gradual. Even over several centuries, it won't suddenly engulf an entire country like Japan.

Japan's terrain itself varies, with most areas being mountainous, and many cities built on higher ground. Furthermore, the Japanese people have a strong disaster prevention awareness. They have long built numerous breakwaters and seawalls, and are continuously reinforcing coastal facilities to cope with rising sea levels and tsunamis.

To give an analogy, it's like living by the sea: you might worry if you see the tide rise a bit, but you wouldn't expect your entire house to suddenly sink into the ocean forever one day, would you? It's pretty much the same principle.

In summary, Japan will not be "swallowed" by the Pacific Ocean, but climate change does present some challenges, and they are continuously working on ways to address them.