Yes, I heard of tsunami. Tsunamis are giant waves caused by earthquakes or volcanic eruptions under the sea. When tsunami waves become extremely large in height, they savagely attack coastlines, causing devastating property damage and loss of life. Tsunami waves destroy boats, buildings, bridges, cars, trees, telephone lines, power lines - and just about anything else in their way. The violent force of the tsunami results in instant death, most commonly by drowning. Fishing families, who live near the coast, may have lost their house and lives.