To find the Astral Cavern in Fisch, go to Cryogenic Canal in Northern Expedition, head down through the small arch passage, walk under the large arched bridge, jump into the gap beneath it, then enter the hidden opening at the bottom.
The Cryogenic Canal Astral Cavern is one of the hidden fishing spots added with the Astral Observatory update, and it is easy to walk straight past because the entrance is tucked under a bridge rather than marked on the map. This guide covers the specific cavern shown in-game as Cryogenic Canal – Astral Cavern, reached from the Cryogenic Canal base camp on the Northern Expedition — not any of the other Astral Caverns scattered around the map. Follow the route below and you will drop right into it.
Where the Cryogenic Canal Astral Cavern sits
| Detail | Location |
|---|---|
| Starting area | Cryogenic Canal, Northern Expedition (third base camp) |
| Target sub-area | Cryogenic Canal – Astral Cavern |
| Entrance cue | Gap in the floor beneath the large arched bridge |
| GPS coordinate | (20047, 610, 5857) |
Key You are heading for a secret sub-area beneath Cryogenic Canal, the third base camp on the Northern Expedition island. The key landmark is a large arched bridge partway down the canal — the entrance is the small gap in the floor directly under it, which drops you into a shaft that loads the cavern. If you like to travel by coordinate, the sloped-bridge entrance sits at roughly GPS (20047, 610, 5857).
How to reach Astral Cavern from Cryogenic Canal in Fisch
The whole route is a short descent from the Cryogenic Canal camp down to a hidden gap under a bridge, so the trick is knowing exactly where to drop rather than fighting the terrain.
STEP 1/6
Travel to Cryogenic Canal
Start at the Northern Expedition camp and follow the path down into Cryogenic Canal, the third base camp on the island.
STEP 2/6
Go through the small arch passage
Keep heading downward and look for a small, arch-shaped opening, then continue along the path behind it.
STEP 3/6
Reach the large arched bridge
Follow the passage until you come out at a large arched bridge and walk underneath it.
STEP 4/6
Jump into the gap under the bridge
Look for the small gap in the floor beneath the bridge and jump in — the “Cryogenic Canal – Astral Cavern” popup appears as you drop.
STEP 5/6
Drop to the lower section
Fall all the way down the shaft to the hidden lower part of the cave.
STEP 6/6
Enter the hidden entrance
Go through the hidden entrance at the bottom to load into the Astral Cavern fishing area.
Once you have dropped in once, remember the gap under the large arched bridge — every return trip is just a run down the canal and a jump, with no items or unlocks needed.
Video help
Confirming you dropped into the right cavern
The moment you fall into the gap under the bridge, a location popup reading Cryogenic Canal – Astral Cavern flashes on screen — that is your confirmation the route worked. Inside, the fishing spot is unmistakable: a glowing purple and black portal-like pool sitting in the dark icy rock. If you see that void-style fishing hole, you are in the correct cavern. Any server-wide event banners that scroll past while you are down there are unrelated to the location, so ignore them.
Why the Astral Cavern is worth the trip
| Item or use | What to know |
|---|---|
| Quartz Glass | Caught here; used to craft the new Meteoric Rod |
| Golden Trout | A high-rarity catch from this pool |
| Dr. Crookspine quest | The cavern supplies items connected to this questline |
| Astral Observatory progression | Part of the wider bestiary and telescope-lens goals in the update |
This cavern is a progression stop for the Astral Observatory content rather than just another fishing pond. It is where you catch materials tied to the Dr. Crookspine questline and, most importantly, Quartz Glass — the crafting material for the new Meteoric Rod. That makes it a repeat-farm spot: come back whenever you need more of the cavern’s catches for the Astral Observatory goals.
Treat the exact catch pool as a farming route rather than a fixed list — beyond the examples above, drops and rarity can shift, so keep fishing until you have what the recipe or quest asks for.
Telling this cavern apart from the other Astral Caverns
| Place | How it differs |
|---|---|
| Snowcap Blue Moon Astral Cavern | Under Snowcap Island, Winter-only, opened with a Blue Moon Totem |
| Abyssal Zenith Astral Cavern | Reached by Submarine into Marian’s Veil, through a black-hole opening on the sea floor |
| Everturn Forest Astral Cavern | At the Everturn Forest pond/waterfall, entered through an opening on the left |
| Boreal Hollow | A separate secret cave in Boreal Pines — not an Astral Cavern at all |
The Astral Observatory update added several Astral Caverns in different biomes, and their routes have nothing in common — following the wrong one is the most common way players get lost. The table below is only to keep you pointed at the Cryogenic Canal route; each of the others is its own trip with its own requirements.
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Frequently Asked Questions
Is the Cryogenic Canal Astral Cavern the same as Boreal Hollow?
No. Boreal Hollow is a different secret location out in Boreal Pines at roughly (21385, 249, 3816). The two get confused because both feed into Astral Observatory progression, but they are separate areas with separate routes — Boreal Hollow is not reached by the under-the-bridge drop in Cryogenic Canal.
Do you need the Blue Moon Totem to enter the Cryogenic Canal Astral Cavern?
No. The Blue Moon Totem — which costs around 1,200,000 C$ — is only for the Snowcap Blue Moon door and its Winter-season gate. The Cryogenic Canal cavern has no item cost and no season requirement; you just need to walk the route and drop through the gap.
What should you do if you cannot see the gap under the bridge?
Make sure you are actually standing underneath the large arched bridge, not on top of it, then look straight down for the small opening in the floor. It is easy to overshoot on the way down the canal, so if you do not see it, backtrack to the bridge and approach from below. A glide or jetpack helps you line up the drop cleanly instead of falling past the gap.
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