diff --git a/web/content/access/index.md b/web/content/access/index.md
index 4787544..4006079 100644
--- a/web/content/access/index.md
+++ b/web/content/access/index.md
@@ -11,7 +11,7 @@ access to the login machine using a resource petition in the BSC intranet.
 
 Then, to request access to the machines we will need some information about you:
 
-1. Which machines you want access to (hut, owl1, owl2, eudy, koro...)
+1. Which machines you want access to ([hut](/hut), [fox](/fox), owl1, owl2, eudy, koro...)
 1. Your user name and user id (to match the NFS permissions)
 1. Your real name and surname (for identification purposes)
 1. The salted hash of your login password, generated with `mkpasswd -m sha-512`
diff --git a/web/content/fox/_index.md b/web/content/fox/_index.md
new file mode 100644
index 0000000..554794f
--- /dev/null
+++ b/web/content/fox/_index.md
@@ -0,0 +1,97 @@
+---
+title: "Fox"
+description: "AMD Genoa 9684X with 2 NVIDIA RTX4000 GPUs"
+date: 2025-02-12
+---
+
+![Fox](fox.jpg)
+
+Picture by [Joanne Redwood](https://web.archive.org/web/20191109175146/https://www.inaturalist.org/photos/6568074),
+[CC0](http://creativecommons.org/publicdomain/zero/1.0/deed.en).
+
+The *fox* machine is a big GPU server that is configured to run heavy workloads.
+It has two fast AMD CPUs with large cache and 2 reasonable NVIDIA GPUs. Here are
+the detailed specifications:
+
+- 2x AMD GENOA X 9684X DP/UP 96C/192T 2.55G 1,150M 400W SP5 3D V-cach
+- 24x 32GB DDR5-4800 ECC RDIMM (total 768 GiB of RAM)
+- 1x 2.5" SSD SATA3 MICRON 5400 MAX 480GB
+- 2x 2.5" KIOXIA CM7-R 1.92TB NVMe GEN5 PCIe 5x4
+- 2x NVIDIA RTX4000 ADA Gen 20GB GDDR6 PCIe 4.0
+
+## Access
+
+To access the machine, request a SLURM session from [hut](/hut) using the `fox`
+partition:
+
+    hut% salloc -p fox
+
+Then connect via ssh:
+
+    hut% ssh fox
+    fox%
+
+Follow [these steps](/access) if you don't have access to hut or fox.
+
+## CUDA
+
+To use CUDA, you can use the following `flake.nix` placed in a new directory to
+load all the required dependencies:
+
+```nix
+{
+  inputs.jungle.url = "jungle";
+
+  outputs = { jungle, ... }: {
+    devShell.x86_64-linux = let
+      pkgs = jungle.nixosConfigurations.fox.pkgs;
+    in pkgs.mkShell {
+      name = "cuda-env-shell";
+      buildInputs = with pkgs; [
+        git gitRepo gnupg autoconf curl
+        procps gnumake util-linux m4 gperf unzip
+
+        # Cuda packages (more at https://search.nixos.org/packages)
+        cudatoolkit linuxPackages.nvidia_x11
+        cudaPackages.cuda_cudart.static
+        cudaPackages.libcusparse
+
+        libGLU libGL
+        xorg.libXi xorg.libXmu freeglut
+        xorg.libXext xorg.libX11 xorg.libXv xorg.libXrandr zlib
+        ncurses5 stdenv.cc binutils
+      ];
+      shellHook = ''
+        export CUDA_PATH=${pkgs.cudatoolkit}
+        export LD_LIBRARY_PATH=/var/run/opengl-driver/lib
+        export SMS=50
+      '';
+    };
+  };
+}
+```
+
+Then just run `nix develop` from the same directory:
+
+    % mkdir cuda
+    % cd cuda
+    % vim flake.nix
+    [...]
+    % nix develop
+    $ nvcc -V
+    nvcc: NVIDIA (R) Cuda compiler driver
+    Copyright (c) 2005-2024 NVIDIA Corporation
+    Built on Tue_Feb_27_16:19:38_PST_2024
+    Cuda compilation tools, release 12.4, V12.4.99
+    Build cuda_12.4.r12.4/compiler.33961263_0
+
+## Filesystems
+
+The machine has several file systems available.
+
+- `$HOME`: Mounted via NFS across all nodes. It is slow and has low capacity.
+  Don't abuse.
+- `/ceph/home/$USER`: Shared Ceph file system across jungle nodes. Slow but high
+  capacity. Stores three redundant copies of every file.
+- `/nvme{0,1}/$USER`: The two local NVME disks, very fast and large capacity.
+- `/tmp`: tmpfs, fast but not backed by a disk. Will be erased on reboot.
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