Of course the other option is to measure the thickness of your board where the bubble is and set a drill bit to that length and carefully drill through the bottom of your board to the bubble.
Then inject epoxy resin into the bubble and then rest the board upside down on a flat surface so the bubble is compressed flat.
Then fill up the remaining drill hole with resin.
This way is much better as it avoids having to make a penetration in through your deck pad which could cause problems with water ingress later.