Off the coast of Panama - November 29th, 1961 AD - 0900 Hours
The surface of the waters off the nation of Panama, part of Area 4 of the Britannian Empire, were calm and clear. Fishing boats, personal yachts and other vessels ranging from military ships to massive cargo transports all plied the waters with many heading for the canal carved through a mountain range on both sides of a great lake.
The Panama Canal, owned by the Duchess of Panama who inherited it by some very clever trickery thanks to her own guile and the guile of her ancestors who made sure that the wealth of the canal flowed into their coffers and for over a century the canal had ensured that the Duchy of Panama was among one of the wealthiest in Britannia.
But deep under the waters, sitting on the sea floor and being poked at by curious fish, seven warships planned out how they would cripple the canal with their forces. Or rather, the battleship and the two cruisers were discussing the plan while the four destroyers were busy playing with the fish in the water that were curiously flitting around them.
"Okay, so we have to close that canal. Problem is, the Pudding isn't going to do a damn thing to seal all of...that." Kiso waved at the canal in the distance, "We need to completely destroy it, and keep it closed long enough to grab the entire Pacific."
"Hmm, what if we blow up the mountains?" Kongou suggested as her brown hair floated in the dark ocean depths, her blonde twin looking out into the darkness in silence, "If we destroy the mountains, then the lake will drain and they can't use the canal, right?"
"That might work," Takao noted, placing a hand to her chin before she adjusted her beret, "Even with earth-moving equipment it will take months to years to clear everything and if we bomb the locks at Gatun, the lake will drain out into the Atlantic. There will be extensive flood damage, of course, but a two-pronged strike should be sufficient to neatly and cleanly shut down Panama for the foreseeable future."
"I like it." Kiso spoke up, adjusting her eyepatch, "Fire off a Graviton Cannon shot underneath the mountain will cause the earth to shift and collapse inwards, follow up with a nuclear strike on the Atlantic-side locks."
"Why nuclear, Kiso?" Kongou asked, her blonde hair stiff in the ocean currents even as the skirt of her black dress drifted in their pull, "According to the Supreme Flagship these people have no knowledge of nuclear weapons nor of radioactive fallout. So the usage of nuclear warheads is both needlessly wasteful and serves no real psychological impact."
"I think there's a real psychological impact to be had when a miniature sun goes off in their locks," Kiso spat, "Besides, Britannia is supposed to be bullshit-tier right? I figure tossing 'em this little curveball and giving the survivors a fucking death-metal story to tell will show that we mean business."
"I don't think that would be smart," Takao retorted with a shake that sent blue hair drifting, "Standard warheads should be enough to collapse the locks at Gatun and drain Gatun Lake. With the mountain ranges collapsed on the Pacific Side along with any shipping being stranded in the lake bed, the chaos will be enough."
Kiso grumbled but accepted the reasoning as Takao placed a hand to her chest, "I, Takao, also volunteer to fire the shot that will collapse the mountain range on top of the Pacific-side locks."
Kongou nodded energetically, "Of course! What do you think Kongou, will you let Takao take the shot?" Still standing at her position looking out into the darkness, Kongou nodded minutely which prompted a delighted laugh from Kongou, "Right! Takao, we'll launch the missiles at the Gatun Locks, but it'll be up to you to fire the Graviton Cannon shot into the right place!"
Kiso nodded, "So long as we've got a plan." She turned to the four destroyers, grimacing as Akatsuki struggled in the grip of a very, very large shark before Ikazuchi slammed a fist into its head and it released the dark-haired Mental Model and swam back into the depths, "Hoi! Brats! Get ready to move out!"
A data packet with the operation plan was sent to the four destroyers and Ikazuchi pumped a fist, "Yosh! You can count on us! Right Inazuma? Hibiki?"
"Y-yes!"
"Da."
"H-hey, wait a minute! When did you become squadron leader?" Akatsuki shouted in a fluster as the other girls giggled and ran back to their ships while Kongou walked over to her brown-haired twin.
"You're worried." She stated without preamble and the happy smile on Kongou's face vanished before she nodded.
"I am. Crippling the canals is a good step, but it took nearly a week for the Supreme Flagship to fabricate us. I'm not sure what she has in mind to help with the ship-building efforts. We need more of...everything." The Mental Model sighed, "I miss Haruna and Kirishima, and Hiei. But I don't know if the Supreme Flagship can handle the system stress."
Kongou nodded, "Yes, I noticed. She hid it well from the others, but you noticed as well didn't you? She was already working on another hull when we left." She looked out at the darkness, towards Iwo Jima, "What is she planning?"
"Well! Leave that for later!" Kongou declared, "Right now we should go up there and introduce ourselves!" Sand and silt began to shift and fish scattered as the battleship began to rise, followed by the two cruisers and four destroyers in a flurry of bubbles and displaced sand while Kiso spoke to the Destroyers.
"Okay you four, you're the screening force. Keep any missiles and enemy ships off us while Takao brings down the mountains and Takao and me bomb the locks on the other side of the canal. Kongou will provide you four with orders and support so don't mess this up, got it?"
"Roger!" The four young girls shouted as they began moving through the ascent into a diamond formation before Takao halted her ascent, hull splitting open to reveal her Graviton Cannon array.
"Remember Takao! We want to collapse the mountain!" Kongou shouted as the rest of the squadron continued their ascent towards the surface, her blonde twin taking control of the cannons to aim at a passing container ship before it passed beyond the small flotilla as the first bubbles began to reach the surface.
"Understood!" Takao turned her attention to aiming at the right position when she heard her darker-haired, and unfairly busty, twin suddenly gasp.
"Oh no! Takao, we have a problem!" Immediately a diagnostic came up and Takao paled at what she saw; the port-side energy regulators had gotten infiltrated by seawater, creating a circuit that was at risk of overloading the gravimetric cycler units.
"Dammit! Can we purge?" She asked as the Graviton Cannon finished expressing.
"It would take too long! We have to be ready to fire as soon as Kongou gives the order!" Takao replied a touch frantically as the two Mental Models wracked their brains for a solution before the bluenette came up with an idea.
"I've got it. We'll shut down the port-side cycler units and yellow-line the starboard units while tightening the focusing array by point-three percent. That should still give us enough explosive power to create a catastrophic collapse along most of the Culebra Cut."
The brunette nodded, "It should work. Continue aiming, I'll get everything set up!"
***
The flotilla broke the surface in full view of most of the shipping exiting and entering the canal as well as in full sight of onlookers who crowded to get a better look at the strange event that was occurring when every radio and TV channel in Panama suddenly went to static before showing a severe-looking blonde beauty with disturbing crimson eyes.
"Good morning. My name is Kongou and I am here with a request that you shut down the Panama Canal and cease all naval traffic into the Pacific Ocean. Now that the request has been made, we will now pre-empt your refusal by shutting down the canal anyway." The signal cut out and Kongou turned to her twin, who grinned fiercely.
"OKAY! BUR-NING! LO-OVE!" The main guns of the Kongou fired, sending guided explosive shells streaking into the inbound Britannian naval destroyer approaching the flotilla as the Fog Destroyers opened fire on all visible shipping vessels, beam cannons destroying engines and punching holes below the waterlines of every trade vessel in their significant range while Kiso fired a spread of missiles that streaked into the sky towards the Gatun Locks at the other side of the massive artificial lake as well as the nearby dam.
The dam was the first to go as the supersonic warhead detonated in mid-air, sending high-velocity penetrators deep into the concrete before nano-explosive charges detonated, creating deep cracks and fissures that the water eagerly pushed into, further pushing open the fissures until the concrete gave way with a heaving, thunderous crashing as the dam simply shattered under the pressure.
At the Gatun Locks, the missiles struck like hammers; squash-head warheads designed to collapse bunkers deformed against steel lock doors and detonated with such force that they were ripped off their hinges, their great weight seemingly invisible to the tide of water sweeping them down to smash into everything they encountered from buildings to people swept away by the flood.
And deep underwater, energy coursing through their ad-hoc solution to the water infiltration problem, Takao received the order to fire.
"Are you ready?" The brunette shouted to the bluenette who shrugged helplessly before they both focused on their target point.
"FIRE!"
The waters seemed to shift as the Graviton Cannon fired, a corridor of hyper-compressed water and gravitational energy lancing down to punch through the sea floor and deep into the bedrock, carving through rock at a pace of hundreds of meters per second as the beam descended lower and lower through the earth until it hit the position where it should have reached critical mass and detonated.
But it didn't. Despite the energy flow being cut off, the focused beam cut deeper and deeper, down to the distant Pedro Miguel fault-line. Where it detonated. Close to a gigaton of energy, trapped with very little in the way of exits, shattered the section of fault-line down to the mantle just in time for millions of tons of seawater to pour in and explosively vaporise inside the hellish inferno.
The results were immediate and worthy of a movie; a section of the canal bulged upwards before exploding in a plume of fire, dust and rock that sent debris flying for kilometers, following by steam escaping with enough pressure that it reached the stratosphere and upper atmosphere in a matter of seconds.
Following on the heels of the steam was the lava, spraying upwards as the shattered section of fault-line collapse and the resulting pressure drop sent shockwaves reverberating into other fault-lines. The result was easily apparent; an earthquake shook Panama, agitating more loose rock and magma into being forced upwards with greater force, smoke and ash beginning to pour into the sky above roiling cauldron of lava and superheated seawater.
Stabilising themselves against the shockwaves, the ships of the Sphinx Task Force stared at the volcanic eruption and earthquake tearing apart Panama. It was then that Takao chose to surface, coming up near Kiso who turned to the Mental Models aboard the ship, "What the hell did you two do? You were supposed to collapse the mountains!"
A thunderous cracking drew all eyes to the mountains, which were now beginning to rapidly break apart and send their own stream of death down towards the city and the ruined canal. Takao rubbed the back of her head while her sister Mental Model chose to hide her face behind her beret, blushing beet-red.
"We're going." Every turned to Kongou, who was staring at the scene with cool scarlet eyes, "We're done here, and there's nothing else we can do for or to these people."
Slowly, the flotilla turned away and departed the area, slowly sinking back under the waves after several minutes.
Not one of them attempted to update Youko over the Joint Tactical Network.
***
Y2: -Hey, did you know your girls just started a volcanic eruption and earthquake in Panama?-
Y1: -They. Did. WHAT?!-