This submersible can float and glow while snorkeling underwater. By adjusting the density settings, the submersible maintains stable buoyancy in water—simply by adding water to the hull or attaching weights to control its diving depth. The submersible is equipped with two small LED lights. The front section of the submersible is crafted from a transparent material; I’ve set the wall thickness to just two layers. If you don’t have access to transparent materials, standard PETG can still transmit light, though the effect may be slightly less pronounced. The two LEDs inside the submersible are mounted facing opposite directions—one shines forward to simulate the submersible’s searchlight, while the other illuminates the interior, causing the entire submersible to glow (whether it actually glows depends on the material used; PETG tends to appear slightly more translucent). Two areas require adhesive.