Seismic surveying, as explained by Oceana

Seismic surveying is used to map potential oil deposits, often deep under the sea floor. Here is how the conservationist group Oceana explained it in a 2015 video.

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Because Gulf Whales are not considered by the oil industry, the decline of their population is lain at the feet of the louisiana restoration program. there's a lot of complaining about regulations, but if the Gulf took take of its dolphins and whales, there wouldn't be any concern about the impact of river restoration on dolphins in barataria bay.