---
product_id: 347733247
title: "Unfathomable"
brand: "fantasy flight games"
price: "¥31832"
currency: JPY
in_stock: null
reviews_count: 13
category: "Fantasy Flight Games"
url: https://www.desertcart.jp/products/347733247-unfathomable
store_origin: JP
region: Japan
---

# 4-6 hours immersive gameplay 3-6 players co-op voyage Hidden traitor mechanic Unfathomable

**Brand:** fantasy flight games
**Price:** ¥31832
**Availability:** ❌ Out of Stock

## Summary

> 🌊 Outsmart the deep, or be swallowed by the dark!

## Quick Answers

- **What is this?** Unfathomable by fantasy flight games
- **How much does it cost?** ¥31832 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/347733247-unfathomable)

## Best For

- fantasy flight games enthusiasts

## Why This Product

- Trusted fantasy flight games brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Master the Deep Ones:** Strategically manage supplies and fend off monstrous threats lurking beneath the waves.
- • **Navigate the Unknown Together:** Collaborate with up to 6 players to survive the treacherous Atlantica voyage.
- • **Trust No One, Suspect Everyone:** Hidden traitors and cultists keep tension high and alliances fragile.
- • **Immersive Arkham Horror Universe:** Dive deep into a richly thematic experience that blends mystery, suspense, and strategy.
- • **Epic Game Sessions for True Strategists:** Engage in 4-6 hour sessions that reward patience and tactical mastery.

## Overview

Unfathomable is a 3-6 player cooperative board game set in the Arkham Horror Files universe, featuring hidden traitor mechanics and strategic gameplay lasting 4-6 hours. Players work together aboard the steamship Atlantica to manage resources, uncover cultists, and battle monstrous Deep Ones, delivering a suspenseful and immersive experience for ages 14 and up.

## Description

Embark on a journey of mystery and suspense aboard the steamship Atlantica in Unfathomable, the latest installment in the Arkham Horror Files series. As the vessel makes its way to Boston, dark shadows lurk beneath the waves, and the passengers seem unnaturally fixated on the sea. The investigators must grapple with suspicion and hidden loyalties as they navigate the treacherous waters, striving to uncover traitors and fend off the monstrous Deep Ones threatening the ship's safety. In Unfathomable, players must work together to manage supplies, battle swarming Deep Ones, and uncover the nefarious cultists or hybrid Deep Ones among them. With tension mounting and paranoia running high, every decision could spell the difference between survival and disaster. Will you uncover the truth and steer the Atlantica safely to its destination, or will the dark forces lurking below claim victory? Dive into the depths of mystery and intrigue with Unfathomable.

Review: Great co-op game with a great theme. - The is a co-operative game with a hidden traitor mechanics. I have two members of my family that hate traitor mechanics because it feels like they are lying, but with this game you can reveal any time you want. This creates less pressure. The game is very balanced. It usually takes us 4 hours to finish with the longest being 6 hours. The board is gorgeous. The plastic molds are good quality and the same with the cards. The first couple of times we lost to the deep but then we learned how to beat them. Certain characters work well together.
Review: Intriguing Challenge with a Learning Curve - Unfathomable is a captivating strategy game that offers a challenging and immersive experience for teens and adults alike. Set in the Arkham Horror universe, this hidden traitor board game keeps players engaged with its blend of strategy and intrigue. One of the game's strengths is its depth and complexity, providing a rich gaming experience that unfolds over multiple playthroughs. The hidden traitor mechanic adds an extra layer of tension and suspense, keeping players on their toes as they navigate alliances and suspicions. However, the learning curve for Unfathomable can be steep. New players may find it challenging to grasp all the rules and intricacies initially, leading to longer playtimes as everyone becomes familiar with the mechanics. Despite this initial hurdle, the game's depth and replayability make it a rewarding choice for those willing to invest time in mastering its strategies. Once players overcome the learning curve, Unfathomable offers hours of fun and strategic gameplay. Overall, Unfathomable earns a four-star rating for its engaging gameplay and thematic depth, with the caveat that it may require patience and multiple playthroughs to fully appreciate.

## Features

- INTRIGUING THEME: Dive into the Arkham Horror Files universe with Unfathomable, a game of hidden loyalties and devious strategy set aboard the steamship Atlantica.
- THRILLING GAMEPLAY: Work together with 3 to 6 players to navigate the treacherous waters, manage supplies, and fend off monstrous Deep Ones threatening the ship's safety.
- HIDDEN TRAITORS: Beware of fellow passengers who may secretly be cultists or terrifying hybrid Deep Ones, plotting to sabotage the voyage and drag the Atlantica to a watery grave.
- IMMERSIVE EXPERIENCE: Experience the tension of battling swarming Deep Ones while uncovering traitors, all while striving to steer the Atlantica safely to its destination in Boston.
- HIGH-SEAS SUSPENSE: With eerie underwater nightmares plaguing the investigators and suspicion running rampant, Unfathomable delivers a thrilling and immersive board game experience.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B096KW4QWX |
| Best Sellers Rank | #180,247 in Toys & Games ( See Top 100 in Toys & Games ) #4,656 in Board Games (Toys & Games) |
| Customer Reviews | 4.7 4.7 out of 5 stars (420) |
| Item Weight | 4.7 pounds |
| Item model number | UNF01 |
| Language | English |
| Manufacturer | Asmodee |
| Manufacturer recommended age | 14 years and up |
| Product Dimensions | 11.63 x 4 x 0.1 inches |
| Release date | November 12, 2021 |

## Images

![Unfathomable - Image 1](https://m.media-amazon.com/images/I/71P1yjvzFwL.jpg)
![Unfathomable - Image 2](https://m.media-amazon.com/images/I/91pkSZRMWSL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great co-op game with a great theme.
*by B***U on April 13, 2025*

The is a co-operative game with a hidden traitor mechanics. I have two members of my family that hate traitor mechanics because it feels like they are lying, but with this game you can reveal any time you want. This creates less pressure. The game is very balanced. It usually takes us 4 hours to finish with the longest being 6 hours. The board is gorgeous. The plastic molds are good quality and the same with the cards. The first couple of times we lost to the deep but then we learned how to beat them. Certain characters work well together.

### ⭐⭐⭐⭐⭐ Intriguing Challenge with a Learning Curve
*by A***A on May 6, 2024*

Unfathomable is a captivating strategy game that offers a challenging and immersive experience for teens and adults alike. Set in the Arkham Horror universe, this hidden traitor board game keeps players engaged with its blend of strategy and intrigue. One of the game's strengths is its depth and complexity, providing a rich gaming experience that unfolds over multiple playthroughs. The hidden traitor mechanic adds an extra layer of tension and suspense, keeping players on their toes as they navigate alliances and suspicions. However, the learning curve for Unfathomable can be steep. New players may find it challenging to grasp all the rules and intricacies initially, leading to longer playtimes as everyone becomes familiar with the mechanics. Despite this initial hurdle, the game's depth and replayability make it a rewarding choice for those willing to invest time in mastering its strategies. Once players overcome the learning curve, Unfathomable offers hours of fun and strategic gameplay. Overall, Unfathomable earns a four-star rating for its engaging gameplay and thematic depth, with the caveat that it may require patience and multiple playthroughs to fully appreciate.

### ⭐⭐⭐⭐⭐ Best hidden traitor game
*by D***V on February 12, 2026*

One of the best games out there.

## Frequently Bought Together

- Unfathomable | Strategy Game for Teens and Adults | Arkham Horror | Hidden Traitor Board Game | Ages 14+ | 3-6 Players | Average Playtime 120-240 Minutes | Made by Fantasy Flight Games
- Fantasy Flight Games Unfathomable: from The Abyss Board Game Expansion - Deeper Peril on The SS Atlantica! Cooperative Horror Strategy Game, Ages 14+, 3-6 Players, 2-4 Hour Playtime

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-03-18*