Termites in the wood chips! During my search for an organic way to control them, I came across beneficial nematodes. I'd heard great things about beneficial nematodes in the past for regular larva control of garden pests, but didn't realize they're also effective against termites. Here's the pack I bought: https://amzn.to/3ocxPm4 (affiliate link) I bought two applications of 50 million nematodes from @naturesgoodguys This included fast shipping with an ice pack since they have to be refrigerated