Some time ago I made an update to Miner's Dream Datapack, which was abandoned by the author. Let me remind you that this datapack allows you to dig 10x4x100 tunnels with one hit using a special pickaxe , leaving undestroyed ores, both in Overword and Nether.
Someone asked if I can rework the datapack in such a way that it digs downwards instead of forwards, because it would be useful for perimeters.

Here is that modification:

Datapack removes the entire chunk to a depth of 128 blocks. In short, with one hit, we make a hole in the ground 128 deep, 16x16 blocks, leaving the ores undestroyed.
Please note the attached screenshots: stand on the magenta block and destroy the blue one. Of course, you don't have to place these colored blocks, they are just markers for description.

For this you need a pickaxe identical to the one in Miner's Dream Datapack:

Pick is crafted by throwing 2 logs and 3 iron blocks on top of a crafting table.
Use oak, spruce, birch, jungle, acacia, dark oak logs, mangrove, cherry logs and crimson and warped stems.


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I encourage you to check out other datapacks that I have published:

Archaeology with hadron
Let"s loot some chests with hadron
Skeleton skull from the nether
Magma cream from slimes
Geode massacre
Real Hero of the Village
Alternative bartering
Amethyst beacon
Copper beacon
Vein mining
Miner's dream datapack
Dig perimeter with one hit
Upgrade your wither skeleton farm farm
A little easier spire armor trim template and piglin's head
Enderman killed in the nether gives eye of ender
Diamond Geode
Cutting Vanilla, Terrestria-and-Traverse-wood