Shift toward the back wall of the canyon so Vogel fires on the 2 crimson-and-silver tanks there. Use the bits still left driving to build a sprinkler, which then results in a lovely flower garden to sprout. Following a couple moments, the sprinkler explodes and artifact piece #six seems. From https://playdesertblockpuzzleonli89999.isblog.net/a-simple-key-for-block-puzzle-desert-adventure-game-unveiled-53063798