Relax Gaming’s submarine slot grows from 5×3 to 5×5 across three depth zones, scaling 243 ways into 3,125 with sticky Wild respins.
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Deep Descent drops you into a tin-can submarine and asks you to push past the safe shallows. Released by Relax Gaming in August 2021, this one swaps the studio's usual buy-bonus gimmickry for something stranger: a reel set that physically grows the deeper you sink.
You start small. A regular 5×3 grid, 243 ways, sunlight still rippling on the waves above. Then the random Low-Value Collection feature kicks in, sweeping royals out of bubbles to clear room for the cabin to descend. One row drops in. Suddenly it's 5×4 and 1,024 ways, schools of fish flickering past the porthole. Clear enough royals at that depth and you hit the abyss: 5×5, 3,125 ways, sharks circling the edges of the screen. The win potential climbs with every row added.
The other half of the math comes from the bearded diver Wild. Land him anywhere and he locks tight, triggering free respins while he sticks. More wilds drop in? They stick too, and the respins keep coming. It's a simple loop, but it pairs neatly with the expanding grid, a sticky wild on a 5×5 board hits noticeably harder than the same wild on level one.
Now, the numbers. RTP sits at 95%, which is honestly stingy by Relax standards (most of their catalogue runs 96.2% or higher). High volatility, hit frequency 25.66%, max win 18,814x your bet. Bets cover 0.10 to 50 EUR per spin so it works for casual sessions and bigger swings alike. No ante bet, no buy feature, no dedicated free spins round. Just base game with two interconnected mechanics doing all the heavy lifting.
Visually it leans cartoony. Big-eyed clownfish, pufferfish and an octopus fill the high-pay slots, royals float inside soap bubbles, and the submarine clamps wires onto the reel frame from both sides. Charming rather than cinematic.
Is the 95% RTP a dealbreaker? For grinders, probably. For anyone who wants a fresh take on grid expansion without yet another 5×6 cluster pays clone, Deep Descent earns its place. The progression hook is what keeps you spinning.
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