2 sentences for 打 (dǎ — excavate)

1. 隧道终于打通了。

   suì​dào zhōng​yú dǎ tōng le.

   The tunnel has finally been broken through.

   Source: Dong Chinese Dictionary

2. 工人们经过几个月的努力，终于把这条隧道打通了。

   gōng​rén men jīng​guò jǐ gè yuè de nǔ​lì, zhōng​yú bǎ zhè tiáo suì​dào dǎ tōng le.

   After months of effort, the workers finally broke through the tunnel.

   Source: Dong Chinese Dictionary