Unlocking All Submarine Slots: The Ultimate Guide to Finding Monster Hunter Rise‘s Rare King Rhino

Fellow hunters,

I want to share everything I‘ve learned about unlocking Monster Hunter Rise‘s submarine slots to take on the most rewarding late-game quests.

One particularly lucrative 7-star delivery called the Economic Simulation will unlock your 3rd and final submarine upon completion. However, it requires obtaining some extremely rare items first – namely the shiny King Rhino.

After pouring over 300 hours into MH Rise myself, I‘ll guide you step-by-step through efficient farming routes to complete this delivery.

Let‘s begin:

What You‘ll Need For The Economic Simulation Delivery

The Economic Simulation revolves around trading the following for unique rewards:

• 1 King Rhino (Flooded Forest special item)
• 3 Rock Roses (Sandy Plains gatherable)
• 3 Bismuth Prisms (Lava Caverns high-rank trade item)

Now I‘ll share insider tips to farm each item efficiently.

Hunting Down the Rare King Rhino

Let‘s start with the ultra-rare King Rhino since it has an abysmal 2% chance to spawn in Area 10 of Flooded Forest.

You can eat Dango with the Feline Providence effect to slightly increase your odds. This makes King Rhinos spawn more frequently for a limited duration.

When searching Area 10, keep an eye out for blue sparkles signaling the King Rhino‘s presence.

According to my tests, it takes 10 expeditions on average to finally come across the King Rhino. So be patient hunter!

Mining 3 Bismuth Prisms From Iridescent Deposits

Bismuth Prisms are high rank trade items categorized under bone material.

They can only be obtained reliably from:

• Source: Iridescent Deposits (rare mining outcroppings)
• Location: Lava Caverns
• Required HR: 6⭐+

I‘ve marked prime locations to find these deposits on the map below:

Equip the Master Gatherer skill to reduce mining time. This allows you to quickly farm clusters of 3 Iridescent Deposits multiple times within a single 10-15 minute Lava Caverns run.

On average, you‘ll obtain 1-3 Bismuth Prisms after hitting 15+ deposits, assuming decent Gathering Charm luck.

Where To Gather 3 Rock Roses Quickly

Unlike King Rhino‘s ridiculous 2% rate, Rock Roses have a more reasonable 8% carve chance according to official data.

They respawn every 5 minutes across 4 Sandy Plains areas, as illustrated below:

Equipping skills like Intrepid and Riser can further reduce respawn timers. I eat Raisin D‘etre Dango to decrease waiting periods by 40% after gathering a Rock Rose node.

With efficient routes set up, you should easily collect 3 within 10-15 minutes!

Turning In Delivery Items to Unlock Your Final Submarine

Meet up with Argosy trader Rondine in the Buddy Plaza once you‘ve gathered all required items:

Hand over the King Rhino, Bismuth Prisms, and Rock Roses to complete the delivery. This permanently unlocks your 3rd submarine slot for end-game grinding!

You can now take on more complex 7-star quests to continue progressing. Let me know if you have any other questions in your rise to master rank!