There is a tunnel under the river.

河下面有条隧道。

youdao

They bored a tunnel under the English Channel.

他们在英吉利海峡下面开凿了隧道。

youdao

The hungry drunk plunged a trunk of lungs into the tunnel under the channel.

饥饿的醉汉把一大箱肺投进了水渠下面的隧道。

youdao

After six Eurostar trains broke down in or near the tunnel that runs under the English Channel, the system has been suspended while engineers troubleshoot the electrical problems thought to have been brought on by condensation.

VOA: standard.2009.12.21

He breached the Assyrian siege by digging his famous water tunnel under the city.

CENTERFORSECURITYPOLICY: Jerusalem, the Eternal Front Line

Then, just at the mouth of the tunnel under the Hudson River, the pink rectangle disappeared.

WSJ: PATH's Road Back Is Rocky

The group backs a "hidden road", including a tunnel under the railway line.

BBC: Ely bypass: Council selects 'value for money' route