Oh, I was too busy yesterday to remember Decker. Thanks for always posting the episodes.
Mixed feelings about this one. I like the concept. We've heard so many times over the decades of the Ultra franchise about kaiju living underground and being drawn to the surface by something, but I don't think we've ever seen an episode that actually went into their realm. There have been occasional episodes that showed off the teams' drill vehicles by having them bore into volcanoes or the like, but it's always been to tackle just one monster, never with a suggestion of an entire ecosystem. It's a novel idea to actually enter their world for a change. Although I wonder if they were inspired by Godzilla vs. Kong and its Hollow Earth.
On the other hand, the fact that they were in the monsters' home makes me troubled by how it turned out. It's one thing to kill a monster in self-defense when it invades the human world and lives are threatened. But here, it was humans and Decker invading the monsters' world. It seemed wrong to kill them en masse when they were just occupying their own turf. Indeed, the only reason Pagos and Gudon attacked in the first place was because human miners stole their food supply. They were arguably the ones defending themselves. It really seems that Decker and GUTS-SELECT were on the wrong side of this battle. I feel particularly sorry for the colony of Twintails, who were just standing there watching, not doing any harm.
Also, Ryumon and the captain seemed callously unconcerned with firing nearly blind when Decker was in their line of fire. They didn't even try to warn him.
Also, they set up this character bit of Ryumon driving himself to be perfect, then never really did anything with it. I mean, his relentlessness did save the day, but there wasn't really any thematic resonance with the story, and what the captain said about his perfectionism also being a weakness didn't really connect to anything. So the character bit was just kind of there, and didn't really have an arc to it.