2 sentences for 开挖 (kāi​wā — excavate)

1. 我知道开挖的事。

   wǒ zhī​dào kāi​wā de shì.

   I know about the dig.

   Source: OpenSubtitles

2. 工人正在开挖地基以准备打桩。

   gōng​rén zhèng​zài kāi​wā dì​jī yǐ zhǔn​bèi dǎ​zhuāng.

   Workers are excavating the foundation in preparation for piling.

   Source: Dong Chinese Dictionary