Use Xray to see through blocks and mine to your hearts desire. Note that this is not classic Xray, it is advanced xray. This highlights blocks that have been put on the list. This does not make all blocks see through.
Installing a modpack using the Technic Launcher is easy. If you don't already have the launcher downloaded, visit our download page to get the latest version.
Type in the modpack name (Advanced Xray 1.12.2) or paste the following url into the search box.
Finally, click Install at the bottom right of the launcher after you select Advanced Xray 1.12.2 from the list on the left. The launcher will handle everything else!