比起山岭隧道，海底隧道面临着严峻的防排水形势,特别在长大隧道中，保持隧道的干燥及清洁是隧道安全的基本标准。隧道的防水设计遵循“以堵为主，限量排放，刚柔结合，多道防线，因地制宜，综合治理”的原则。以胶州湾海底隧道为例，对防排水的各种措施，如超前预注浆、开挖后渗漏水的处理、防水板防水以及排水措施等各个方面进行了初步介绍研究。经实践证明隧道的防排水措施是切实有效的。

Compared with mountain tunnels, subsea tunnels face more serious waterproofing and drainage situations. Especially for long tunnels, keeping the tunnel dry and clean is a basic safety requirement. For the design of the waterproofing system of tunnels, the principle of "preferential water sealing, limiting drainage, adopting rigid and flexible system simultaneously, multiwaterproofing methods, adjusting waterproofing measures to local conditions and comprehensive treatment" is followed. Taking Jiaozhou Bay subsea tunnel as an example, the authors make primary study on the waterproofing and drainage measures, including advance pregrouting, leaking water treatment after excavation, waterproofing by means of waterproofing membranes and drainage measures. The engineering practice proves that the waterproofing and drainage measures taken are effective.