I believe you go into your invintory while underground and click on the digger drill while facing the wall and spot you want to use it on and press use. Its that or you click on the spot. Not 100% sure Enjoy:)
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In Eterna City there is a man that gives you an Explorer Kit and a string of tasks. Once you complete these tasks you will be given a Digger Drill. Go into the Underground where you want your secret base to be. Face a wall and use your digger drill. Note that they are in the Trap poket of your bag, not the Goods or Treasures pockets.
You will need a Digger Drill. You can buy on from a Trap Merchant that is underground, or the Underground Man in Enterna City will give you one after you compete all of his missions. To use the Digger Drill, go Underground and find the place where you want your Secret Base to be. Face the wall and open you menu. Click on traps then click on Digger Drill. The Digger Drill will dig a hole which will become your base.
You buy a new digger drill and you use it.
To get an underground secret base, you have to go down there and buy it from a hiker who is selling Traps.He should have a Digger Drill for sale.Buy the Drill from him, then use in on any random underground wall, and... BING!Your secret base is born.
You need to talk to a miner guy under ground. You need to find one with traps. Trade him the orb he wants or bigger for the digger drill! Then pick a spot on the wall where you want your base and use the digger drill trap. ENJOY!!!