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.

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One of them involved the Joint Maritime Seismic Undertaking (JMSU) in 2004 for oil exploration in the South China Sea, which has been shrouded in controversy, as it may have conceded territorial waters to China.

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