You walk through door 60, met by a odd but big room.

[HQ]: "You'll need to make your way through our underwater maintenance tunnels to proceed. I just received a notification that NAVI is requesting permission to give you access to the HydroGlide Unit. Apparently it's a faster way to the crystal, even though you don't have training. But who am I to question an AI's judgement. Good luck."

You'd grab one of the hydrogliders.

[Navi AI]: "Congratulations on completing your glider training. You have been chosen to be part of a select few, who have permission to use the glider tubes for the purpose of maintenance and transportation. I will now be giving you a quick reminder about the safety checklist, which must be followed at all times. Do not turn on the glider outside of the water. Do not drop the Glider. Do not let go of the handlebar whilst in operation. Do not ram the Glider into walls, or other stationary objects. Do not use the Glider to purposely commit roadkill. Do not take the Glider on joyrides. Do not take the Glider through the de-synchronization tunnels without clearance or further training. Should any of these safety procedures be broken depending on the severity, will result in either pay-dock, contractual termination, or execution. If you wish for a reminder, ask a designated Glider station operator. Swim safely!"

You would then go in the water while holding the HydroGlider, turning it on and riding it. It'd suddenly start going really fast, as you went in the tunnel. You'd see a gate open, closing behind you. A small screen on the tunnel wall had a countdown till the gate in front of you opened. The countdown ended and the gate opened. The glider would go really fast again. As you cross the underwater maintenance tunnels, you'd see a large, spikey, neon orange finned lizard. Like a mutated lizard, almost. You followed it, seeing it go left. Then, as you went in a straight line of the tunnel, it'd suddenly charge at you from your left, as you barely dodged it. It'd then charge at you from your right, and you somehow dodge it again. You go in a straight line again, going in the green tunnel, the other 2 tunnels next to it collapsing with a red light. After dodging active fans that could break your HydroGlider, NAVI would put up a virtual "DANGER" sign glowing neon red above the glider's handle. The abomination would charge at you, and luckily you drove to the side before it could bite you. You'd then go in a open underwater section, sea mines everywhere. Green beacon lights would guide you where to go. It'd charge at you 2-3 more times, eventually stopping because you went back in the tunnel. You would have to dodge fans, do hard turns, and even dodge sea mines. You'd then let go of the glider's handlebar, swimming back to it quickly with the abomination right behind you and grabbing back onto it, until you, the glider, and the abomination getting leaped out onto a broken tunnel. You fall hard on the concrete floor, including the HydroGlider which just broke because of the hard fall. The abomination would almost climb up, until NAVI saves your skin and opens the grille that the abomination is right above, making the abomination fall into it (probably) dying. You'd walk up to the HydroGlider only to hear a glitched out navi voice coming from the HydroGlider. You'd limp, seeing a green crate at the end of the room with a green flare. You'd open it and get a medkit. You bandage yourself, adding some lotion on it, feeling better than before.