5 Best Underwater Slots to Play Online

By Charlon Muscat in Slots

Last Updated August 28, 2024 8:48 am PDT

Best Underwater Slots text centered, shark in the ocean in the background

The best underwater slots are the perfect setup for a deep-sea dive without the wet suit. You’ll find these at most offshore gambling sites, equipped with features from Free Spins to Wild multipliers, various volatility levels, and progressive jackpots that just keep growing.

The real challenge is choosing among the lot. And that’s exactly what I’m here to help you with. Check out my top 5 ocean slots or read on to learn why they’re preferred picks.

Rank	Slot Name	RTP%	Where to Play
1	A Big Catch – Hold & Win	96.5%	BetUS
2	Deep Sea	94%	Bovada
3	Big Blue Fishing	95.97%	DuckyLuck
4	Big Bass Fishin’ Fever	95%	SlotsandCasino
5	Shark Spin	97.03%	Super Slots

1. A Big Catch – Hold & Win

Software Provider: Betsoft
Year Debuted: 2024
RTP: 96.5%
Reels: 5
Paylines: 243
Max Win: 3,254x

A Big Catch – Hold & Win by Betsoft is a fishing-themed slot game with a striking design and lively soundtrack, released on July 25th, 2024.

The game takes place across 5 reels and 3 rows and delivers 243 ways to win, with a favorable RTP rate of 96.5% and a hit rate of 35.11%. The max win stands at 3,254x the bet, while volatility is rated highly, meaning wins may be less frequent, but the potential for significant payouts is greater.

The gameplay revolves around landing at least 6 bonus symbols to trigger the Hold & Win feature, which awards 3 re-spins and a chance to collect the Mini, Minor, Major, and Grand Jackpots. There’s also a Buy Feature option to enter the round directly at 83x the bet.

Amongst the other features available are the Wild symbols that appear on reels 2, 3, and 4, substituting for all icons except for bonus and reset symbols. The latter collects all bonus values and advances a multiplier of up to 5x during the Hold & Win feature.

Read about BetUS casino or head there now to play this slot!

Play A Big Catch – Hold & Win

2. Deep Sea

Software Provider: BGaming
Year Debuted: 2019
RTP: 94%
Reels: 5
Paylines: 15
Max Win: $700,000

While Deep Sea by BGaming might not offer the highest RTP, it still ranks among the best ocean slots for its simple yet engaging features.

The slot comes in a simple, user-friendly 5×3 grid and 15 paylines with vibrant, neon-coloured symbols that glow against a dark, deep-sea backdrop. I love how the various mysterious underwater creatures like jellyfish, coral, and other deep-sea plants are presented.

The Wild symbol substitutes for all others except the Scatter, while the latter is your key to unlocking the free spins feature. In fact, landing 3, 4, or 5 of them triggers 10, 12, or 15 free spins, respectively, with the possibility of retriggering.

Additionally, special symbols can appear during this round and randomly add 10 extra Wilds to the reels.

Low-stakes players can start spinning with just $0.15 per spin, and for those who’d like to go bigger, the max bet is $45. Plus, Deep Sea lets you set the reels to spin automatically—just remember to set your win or loss limits to keep things under control.

The audio is as immersive as it gets, with a steady stream of bubbles to keep you in the underwater vibe. Bovada is arguably the best place to pay this underwater slot game. Read our Bovada review or head there to play the game now.

Play Deep Sea

Play at Bovada

3. Big Blue Fishing

Software Provider: Genii
Year Debuted: 2022
RTP: 95.97%
Reels: 5
Paylines: 243
Max Win: 21,800 coins

Big Blue Fishing takes you on a fun underwater adventure along the Southeast coast of the United States. In this game you’ll find yourself surrounded by colorful coral reefs, diverse marine life, and the deep blue sea.

Amongst the many symbols you’ll encounter are the sailfish, grouper, tuna, and tarpon, alongside traditional card symbols A, K, Q, and J. The octopus serves as the wild symbol, and this doesn’t just substitute others like in most other ocean slot machines; it also doubles any win it contributes to. The fishing reel represents the scatter.

This ocean slot game offers a range of betting options, too. You can adjust your stake from a low minimum of $0.25 to a maximum of $62.50, plus there’s the option to enable up to 999 auto spins for uninterrupted gameplay.

Plus, the Max Ways system opens up 243 winning opportunities. YouTube user @slotstragamonedasonline managed to land a whopping $2,000!

Amongst the special features available in Big Blue Fishing, you can land three or more Free Spins symbols to trigger up to 15 free spins.

Additionally, if you land three or more feature game symbols, hence the fishing boat, you can activate the Feature Game and benefit from additional spins. If you’re intrigued, don’t miss out on the best slots with bonus games.

Want to try Big Blue Fishing yourself? DuckyLuck might be the best spot to give it a go thanks to their 500% up to $7,500 bonus. Head there now to play!

Play Big Blue Fishing

4. Big Bass Fishin’ Fever

Software Provider: Dragon Gaming
Year Debuted: 2024
RTP: 95%
Reels: 5
Paylines: 10
Max Win: $200,000

Big Bass Fishin’ Fever is a fine example of the best underwater slots available, featuring 10 fixed paylines and a max payout of $200,000. You can find it at several online casinos, but SlotsandCasino (500% up to $7,500 bonus) is one of the better sites that offers it.

It invites you to dive into an underwater world through a 5-reel, 3-row grid. Symbols include everything you’d expect on a fishing trip—tackle boxes, worms, fishing rods, and even the fisherman’s hat. It comes with an RTP of 95%, high volatility and a broad spectrum of betting options that range from $0.10 to $50.

The free spins round can be triggered when landing three or more bonus symbols, giving you up to 20 free spins. During these rounds, the fisherman wild symbol can appear to collect special symbols and potentially trigger re-spins that can lead to bigger catches—the Symbol Collection feature.

Overall, this game does have a lower RTP, but it’s a visually stunning slot with really nice upside. If you like slots with an ocean or fishing theme, this one should be at the top of your list. Play it now at SlotsandCasino and activate up to 150 free spins with their crypto bonus.

Play Big Bass Fishin’ Fever

5. Shark Spin

Software Provider: Nucleus Gaming
Year Debuted: 2021
RTP: 97.03%
Reels: 5
Paylines: 10
Max Win: 500x

Shark Spin delivers a 5×3 reel configuration set against an underwater world filled with colorful marine life, available at some of the best online casinos.

Amongst the many symbols are the jellyfish, crabs, and other fish, with the Great White Shark acting as the Wild. It expands to cover entire reels, locks in place for a re-spin and potentially leads to a sequence of consecutive wins.

The RTP is a solid 97.03%, paired with medium volatility for that balanced mix of frequent smaller wins and the potential for bigger payouts. If you like the sound of this, check out our breakdown of the 5 best medium volatility online slots. The betting range is quite flexible, too, starting from $0.10 and going up to $100.

Landing three Neptune’s Horn Scatter symbols triggers 10 free spins, but note that these can’t be retriggered. Also, with its availability across multiple devices, it’s easy to see why it’s considered to be one of the best aquatic slots out there.

Play Shark Spin

Finding the Best Underwater Slots Online

There you have it; my favorite online slots with an ocean theme. Whether you’re fishing, scouring the sea for sharks, or just taking in the vast possibilities under the ocean waters, there are a lot of slots that deliver in this theme.

Of course, which underwater-themed slot games you want to play may depend on a few factors. RTP, winning upside, entertainment, bonus games, and the actual site you play at should all contribute to your ultimate decision.

If you’re looking for an underwater slot machine that offers the total package, I think you’ll find it with A Big Catch – Hold & Win. It’s easily the best game on this list, it has a solid RTP, and it’s available at BetUS, which offers a solid 125% up to $2,500 welcome bonus and is one of the most reputable online casinos out there.

There’s more where these underwater slots came from, by the way. While none of them made the cut for this post, you might also want to try out the best mermaid slots if this is one of your favorite slot game themes.

Hopefully this list serves you well. Play any of these games and let me know how you’d rank them. Most of all, good luck!

All the way from the renowned iGaming hub of Malta, Charlon has been contributing to the gambling industry since 2019. He began his career at Paddy Power™, but the onset of the pandemic led him to swap his nine-to-five for a life of full-time travel.

Throughout his journey, Charlon developed a successful freelance career, leveraging his prior industry knowledge and focusing on analyzing online casinos, sportsbooks, slots, payment methods, and current trends and strategies through the lens of an actual player.