1. subaqueous tunnel：subaqueous construction 水下施工 | subaqueous tunnel 水底隧道 | subaqueous tunneling 水底隧道工程
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2. submarine tunnel：submarine pipe line 海底油管 | submarine tunnel 水底隧道 | submatrices 子矩阵
3. Underwater tunnel：Underwater excavation 水底開挖 | Underwater tunnel 水底隧道 | Undisturbed sample 不擾動土壤
4. submarine tunnel WESTBANK：submarine pipe line WESTBANK 海底油管 | submarine tunnel WESTBANK 水底隧道 | submatrices WESTBANK 子矩阵