A:目前,海底隧道主要有两种修建方式:沉管法和盾构法。沉管法是先在陆地上建好一段一段的隧道主体结构,两端用不透水的隔墙先封起来,就像一根根密闭的管子;同时疏浚海底,挖出一条平整的沟槽。由于封闭的预制管里面充满了空气,所以具有很大的浮力,可以漂浮。用船将漂浮的预制隧道 A: At present, there are mainly two kinds of construction methods for undersea tunnels: immersed pipe method and shield method. Immersed pipe method is to first build a section of the main tunnel structure on land, both ends of the first impermeable wall sealed together, like a root of a closed pipe; the same time dredging the sea, dug a smooth trench. Because the closed prefabricated tube is filled with air, it has great buoyancy and can float. Prefabricated tunnel that will float by boat