"Mhm! Dunno what there is to find here, but we plan to find out."

And then with a look down at their clothes — a nightshirt with a heart on it that just barely hangs low enough to cover their panties, stopping mid-thigh — she continues, "And maybe find someplace to buy clothes on the way."

Eva's wearing a black v-necked shirt and a black skirt with a white water-lily pattern.

"Yeah. I've only got this one outfit too. Have you been to any other worlds yet?"

She focuses again. 

"I feel like there's a direction i can go that's... inside me. It feels kind of cozy. And then..."

She points north. "That way to something that feels unsettling..." 

She turns slowly. "And off far to the east, I feel a connection to... peace and tranquility."

Eva frowns. "And... It's weaker, but..." 

She points downwards, into the deeper sea. 

"I feel a vital pulse from deep below us."

"Ducked into the city long enough to get the train, but haven't explored it much. Wasn't keen to stick around in this state of dress, and don't have anything to sell to buy clothes with. Could maybe try for cargo runs?"

She shrugs and smiles.

"Sounds like you've got some interesting connections, though. We've got a similar inward place, but ours feels emptier than cozy. Also got the urban world I mentioned," she points south-southwest, "someplace starlit, welcoming, and loamy-smelling," northeast, "and vasty black," high in the sky to the south.

"Yeah. Surely there's something worth selling on this planet. But if it's all ocean..."

Eva looks over at Sable. "Can this thing dive, or is it a purely surface ship?"

"From deepest blue to highest black, this girl goes everywhere," Sable replies with a fierce grin.

"Niiiiice. I wonder what's down there. Want to go find out?"

"Hell yes." Her left hand grabs a blue lever and flips it, causing a chime and a brief rumble through the locomotive. "Trackless pitch mode enabled, full trackless attitude control unlocked." Her right hand grabs the attitude control, a sphere with rods sticking out of the top and bottom, set into a nested series of partial rings to guide and track its movement. "Diving!"

She tilts the orb forward, pitching downward, and the trainship dives beneath the waves, as though guided by invisible tracks.

"Whoa!" Eva rocks on her feet, taking a wider stance as the craft dives unexpectedly.

Then she grins. "You don't do things by halves, do you? Alright, let's see what's down here."

She goes over to the train windows and looks out. 

The black, jagged rocks descend precipitously into the darkness, forming underwater crags of basalt. Amid them, long strands of heavy kelp float in the waves, darted through by flashing silver fish. As she watches, a siren swims by, catches one of the larger fish in her webbed hands, and tears into it raw with her rows of needle-sharp teeth. 

"Oh, wow..." 

Eva wiggles a little in place; the view is beautiful, even if the savagery of the sirens outside sends a shiver down her spine. 

"It's gorgeous down here." Electroluminescent wires running the length of the train in thin lines switch on, illuminating the water around them with their orange glow. Bright headlights join the running lights, piercing the gloom. Sable's eyes fall on the vision of ferocity out the window, her breath catching in her throat. "And intimidating, that too."

As she sweeps her gaze across the crags and kelp, she hums thoughtfully. "Those... twig our instincts a bit. Feels like we know how to get them to grow, and what they're called. Crag basalt is good stone, and shivering kelp dries like teak, while retaining flexibility like bamboo."

"How do we harvest it without being eaten by sirens, though? Does this thing have robot arms too?"

She pauses. 

"Huh. For some reason it feels like I wouldn't have to worry about drowning. Do you have that too?"

"Drowning is for scrubs," Hailey interjects with a sharp smirk.

"Heh," Sable jumps back in with a softer smile. "Hailey means yes, we do have the no-drowning power. Feels tied to this place, somehow, like our connection here provided it."

"Yeah, it does have that feeling to it."

Eva looks out at the sea. 

"I think we shouldn't dare the deeper parts of the sea just yet. This is more than enough danger already..."

She frowns. "Any thoughts on how to gather wood safely?"

"Hmmm."

"Hailey again. Got an idea," she replies with a grin. "Seawater's more conductive than fresh water, yeah? We got a sparky electrical power from the city world, same place as the train. Electricity just charges us up, and we can zap stuff with it."

"Ooh, like an electric eel! I should probably be, uh, very far away for that though. I'm pretty sure I fry like an ordinary human still."

"Yeah. You stay on the ship, maybe hang out at the cargo hatch once we're parked by a forest and stow kelp I throw at you?"

"Sounds like a solid plan. Does the train have, like, airlocks in this form or no?"

"Even. Fucking. Better." Her smirk sharpens, and she points at the exterior door, the same one Eva just slammed in the face of a siren a few minutes ago. "Go open the door."

Hailey, meanwhile, is piloting the ship steadily toward a nearby forest of shivering kelp. The thick, wavering stalks of seaweed trail deep into the fathomless, darkening blue.

This is probably okay but does not mean she doesn't feel a little scared. 

She goes and opens the door. 

The door swings inward — outward feels like she'd be fighting the force of the water rushing past them and not worth trying while they're moving — but the water doesn't follow it in. Instead, a wall of water presses against the invisible boundary of the threshold, unable to cross into the cabin of the engine.

"Fuckin' sweet, yeah?"