Try To Reach The Abyss Sea Monsters Guide

Sea monsters live in the deeper waters of Try To Reach The Abyss, well beyond the colorful reefs where you spawn. Your best defenses are torpedoes fired from your submarine, torpedo upgrades bought with upgrade points, and the safety of the next outpost marker. Read the location badge's Danger rating as you travel: regions like Forgotten Valley show Danger: High, while outposts such as Glowcap Forest show Danger: Safe.

Where sea monsters appear

The official game description groups dangerous sea monsters with the deeper exploration areas — glowing caves and forgotten valleys — waiting in the darker, stranger waters past the starting reefs. In practice, you can gauge that risk from the location badge on screen. In one recorded dive, the Forgotten Valley badge read "Danger: High" while the outpost Glowcap Forest read "Danger: Safe", and the region strip showed LIVING DEPTHS with a route marker toward Outpost 19. So the further you push along the outpost route into named regions like Forgotten Valley, the more likely you are to run into hostile creatures.

Outposts are the flip side of that danger. Reaching the next outpost grants safety and a free upgrade point, and outposts are also where you step out of your submarine to earn Speed. If a region's badge alarms you, pushing to the next outpost marker is both an escape route and a progression reward.

Quick answer

Sea monsters threaten you in the deeper regions past the starting reefs — watch the location badge's Danger rating. When one attacks, keep piloting toward the next outpost for safety, and fight back with torpedoes you have upgraded with upgrade points.

What to do when a monster attacks

Your submarine's torpedo is the weapon the game is built around. The how-to-play instructions tell you to spend upgrade points on your Speed gains, hull, and torpedoes, and firing torpedoes pairs with collecting Research Data to unlock abilities. That means fighting back is not just survival — torpedo combat feeds directly into the Research Data you need for abilities.

A few practical habits follow from that:

• Upgrade torpedoes alongside hull. Upgrade points are the shared currency for Speed-gain, hull, and torpedo improvements. A tougher hull buys you time to land shots, so don't neglect it entirely for offense.
• Use outposts as your safe fallback. Safety is tied to actually reaching the outpost marker while piloting the submarine, so if a fight goes badly, the marker is your destination, not the open water around it.
• Fight where the danger rating tells you to be careful. A "Danger: High" badge on a region like Forgotten Valley is the game's own signal that hostiles are part of the trip — approach with upgrades rather than a fresh submarine.

The pet that fights for you

If you want passive backup, the pets system offers one combat option. The Crystal Cuttlefish, an EPIC pet from Luminous Caverns, grants +14% submarine speed and carries the label "Also attacks sea monsters." That label describes this specific pet — not every pet in the collection — and the Luminous Caverns pets panel is one of several region collections that also include Forgotten Valley, which stays locked until you reach Outpost 19.

The speed bonus is useful here for a simple reason: faster submarines reach outposts sooner, and reaching the next outpost is what grants safety. A pet that adds speed while also attacking monsters supports both halves of surviving a dangerous dive.

Putting it together

Sea monsters are the game's reason for its combat systems. Deeper regions raise the danger rating on your location badge, torpedoes and their upgrade-point improvements are your active response, the Crystal Cuttlefish pet can add damage alongside a speed boost, and outposts mark the line where danger turns back into safety and free progression. Push deeper when your upgrades are ready, and fall back to the outpost marker when they aren't.

For more on the combat side, see the torpedoes guide and the broader combat guide. To plan the route those dangers sit along, the outposts guide and the how to reach the abyss walkthrough cover the outpost path, while the upgrade points guide explains how to fund your torpedo and hull upgrades.