==MISSING PARTS==

The build is ~96% accurate, with about 13 parts missing, plus the sticker sheet and minifig heads/torsos. I used my own MOC-assembly to replicate a missing part #42604, 6x8x4 'Aircraft Fuselage Angular Top.'

https://rebrickable.com/parts/44572/hinge-panel-2-x-4-x-3-13-locking-dual-2-fingers/
https://rebrickable.com/parts/3626bpr0433/minifig-head-aquaraider-king-dwarf-warrior-light-brown-beard-with-sideburns-and-eyebrows
https://rebrickable.com/parts/3626bpr0458/minifig-head-aquaraider-knight-dwarf-dracus-astronaut-male-scar-across-lip-angry-black-eyebrows
https://rebrickable.com/parts/973pr1300c01/torso-aquazone-aquaraiders-ii-trident-silver-belt-and-zipper-print-medium-blue-arms-black-hands/
https://rebrickable.com/parts/59275/minifig-footwear-flipper-thin/
https://rebrickable.com/parts/2446pr23/minifig-standard-helmet-with-blue-trident-print-aquaraiders-ii/
https://rebrickable.com/parts/58840/sticker-sheet-for-sets-7774-1-and-7775-1/
https://rebrickable.com/parts/44359pat0002/dome-hemisphere-3-x-3-ball-turret-with-marbled-red-pattern/
https://rebrickable.com/parts/45705pr0001/windscreen-10-x-6-x-2-curved-with-blue-scales-print/
https://rebrickable.com/parts/32174/technic-axle-connector-2-x-3-with-ball-socket-open-sides/
https://rebrickable.com/parts/42604/aircraft-fuselage-angular-top-6-x-8-x-4/
https://rebrickable.com/parts/59275/minifig-footwear-flipper-thin/
https://rebrickable.com/parts/44572/hinge-panel-2-x-4-x-3-13-locking-dual-2-fingers/
https://rebrickable.com/parts/3068bpr01381/tile-2-x-2-with-black-trident-print-7773-7775/
https://rebrickable.com/parts/3475b/engine-smooth-small-1-x-2-side-plate-with-axle-holders/
https://rebrickable.com/parts/58840/sticker-sheet-for-sets-7774-1-and-7775-1/

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When submitting 'The Shipwreck' set no. 7776 recently, I kinda bashed the design of "Aqua Raiders" brick-built animals—after completing this model, I'll have to retract my criticism. The giant squid attacking an Aqua Raiders underwater HQ has quite an excellent design; a rather menacing creature is not too cartoonish or frivolous.

This set no. 7775 "Aquabase Invasion" was the largest in a 2007 'Aqua Raiders' series, released by Lego as a follow-up to a classic 1995-'98 "Aquazone" collection, which included the first OG generation of Aqua Raiders fighting against the evil Aquasharks and Stingrays.

Clocking at 840+ parts and five minifigures (including a skeleton), the model includes four main objects:

=Aquabase=
The Aquabase main structure rests on a 16x32 baseplate, raised on massive pylons above the rocky seabed. The spacious Command & Control Room with gigantic panoramic windows is equipped with extra diving gear, service tools, and a control station's dashboard with a coffee mug. A robotic crane arm hovers above, and a Mini-Sub (exploration pod for deep-sea missions) sits on a Launch Ramp in the center of C&C Room, ready to dive any second. (To launch the mini-sub, push the Launch Ramp Trigger).

The base is heavily guarded—first off, a rotating harpoon turret on the top, shooting a torpedo; there's also a "Big F*%#№n' Harpoon Gun" with two rotating barrels on the front of the building.

=Submarine Dock=
Adjacent to the station, there's a vehicle dock for submarines and other vehicles arriving at Aqua Raiders HQ.

=Submarine=
Consists of ~100 parts, with a large half-spherical front canopy and cargo space to carry around the large crate full of treasures. It's armed as well, with a rotating Laser Gun mounted on top.

=Giant Squid=
The sea monster consists of 183 parts, finished mostly in dark blue & black color scheme, with some tan accents and multiple "glow-in-the-dark" pieces, for an even more terrifying and daunting look! Inside a half-transparent belly, one can see glowing veins and a diver's skeleton.

Two eyeballs that rotate independently in their sockets have an excellent color scheme: bottom halves are in white with marbled red 'hazy smoke' pattern, and tops are in the transparent glow (which I didn't even know to exist in Lego before getting to this set).

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=SEE ALSO=

7776: The Shipwreck
https://www.mecabricks.com/en/models/KZvmNoXGaG6

1782: Discovery Station
https://www.mecabricks.com/en/models/9P2k3xwz2on

6441: Deep Sea Refuge
https://www.mecabricks.com/en/models/1k2qKzPEvE0

6559: Deep Sea Bounty
https://www.mecabricks.com/en/models/0DvYGXLA29e

6560: Diving Expedition Explorer
https://www.mecabricks.com/en/models/9P2k3zdm2on