Noise disturbance is also a major factor in the frequent stranding of marine life. Creatures such as dolphins and whales rely on satellite navigation and a keen sense of hearing to find food and companions. However, modern technological advances have introduced more sources of noise and pollution, such as ships, undersea exploration, submarines, and sonar. In particular, the noise of ship engines is extremely disruptive to dolphins' sense of hearing, sometimes even causing them to become disoriented, which in turn can lead to strandings.
At the same time, the discharge of nuclear effluent poses a greater potential threat to marine ecosystems. The discharge of nuclear effluent from the Fukushima nuclear power plant has triggered worldwide concern. Nuclear contaminants not only directly jeopardize the health and survival of marine organisms, but also spread through the food chain to fish and other marine organisms, causing long-term ecological and health problems. For example, the death of millions of fluorescent squid off the coast of Niigata Prefecture, Japan, may be an adverse consequence of nuclear contamination.