Because of the complex seabed structure in the shallow sea and extreme shallow sea, there are many technical problems using high-precision seismic exploration in this area.

由于极浅海及浅海地区海底结构复杂，该地区高精度地震勘探存在许多技术难题。

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Preliminary reports ruled out that seismic sound waves created by oil exploration in that stretch of sea could have killed the birds, the environment ministry said.

CNN: Peru investigates mystery pelican deaths