In this video I’m taking a top-down, no-hype look at the TaG Submarine fountain pen—because it’s one of those pens that’s quietly packed with engineering details. I walk through the first impressions, the feel of that fluted, precision-milled body, and the overall fit and finish (including the concrete finial, which is a very specific vibe). This isn’t a “best pen ever” kind of review—my goal is to show you what it actually is, what it does well, and what quirks you need to know before you give it desk space. The star of the show is the hidden “turbine” mechanism in the finial. I explain how it works as a practical, on-demand way to prime the feed—no fuss, no gimmicks, just a clever solution for getting ink moving when you need it. I also cover nib performance (this one uses a smooth Schmidt nib), then I do a writing sample on Rhodia A5 dot grid with Platinum Carbon Black so you can see real-world line quality and behavior. TaG sent the pen for review, but you’re still getting my unfiltered take on who this pen is really for.