diff --git a/projects/4datlantic-ohc+123/collection.json b/projects/4datlantic-ohc+123/collection.json
new file mode 100644
index 000000000..acac5ef54
--- /dev/null
+++ b/projects/4datlantic-ohc+123/collection.json
@@ -0,0 +1,95 @@
+{
+  "type": "Collection",
+  "id": "4datlantic-ohc+123",
+  "stac_version": "1.0.0",
+  "description": "Given the major role of the ocean in the climate system, it is essential to characterize the temporal and spatial variations of its heat content. The OHC product results from the space geodetic approach also called altimetry-gravimetry approach.",
+  "links": [
+    {
+      "rel": "root",
+      "href": "../../catalog.json",
+      "type": "application/json",
+      "title": "Open Science Catalog"
+    },
+    {
+      "rel": "parent",
+      "href": "../catalog.json",
+      "type": "application/json",
+      "title": "Projects"
+    },
+    {
+      "rel": "via",
+      "href": "https://www.4datlantic-ohc.org/",
+      "title": "Website"
+    },
+    {
+      "rel": "related",
+      "href": "../../themes/oceans/catalog.json",
+      "type": "application/json",
+      "title": "Theme: Oceans"
+    }
+  ],
+  "stac_extensions": [
+    "https://stac-extensions.github.io/osc/v1.0.0/schema.json",
+    "https://stac-extensions.github.io/themes/v1.0.0/schema.json",
+    "https://stac-extensions.github.io/contacts/v0.1.1/schema.json"
+  ],
+  "osc:status": "completed",
+  "osc:type": "project",
+  "updated": "2026-01-22T17:31:12Z",
+  "themes": [
+    {
+      "scheme": "https://github.com/stac-extensions/osc#theme",
+      "concepts": [
+        {
+          "id": "oceans"
+        }
+      ]
+    }
+  ],
+  "contacts": [
+    {
+      "name": "Roberto Sabia",
+      "roles": [
+        "technical_officer"
+      ],
+      "emails": [
+        {
+          "value": "roberto.sabia@esa.int"
+        }
+      ]
+    },
+    {
+      "name": "Magellium",
+      "roles": [
+        "consoritum_member"
+      ],
+      "emails": [
+        {
+          "value": "magellium.fr"
+        }
+      ]
+    }
+  ],
+  "title": "4DAtlantic-OHC",
+  "extent": {
+    "spatial": {
+      "bbox": [
+        [
+          -180,
+          -90,
+          180,
+          90
+        ]
+      ]
+    },
+    "temporal": {
+      "interval": [
+        [
+          "2021-07-06T00:00:00Z",
+          "2025-06-12T00:00:00Z"
+        ]
+      ]
+    }
+  },
+  "license": "various"
+}
diff --git a/projects/catalog.json b/projects/catalog.json
index 225706c9d..a59e5606a 100644
--- a/projects/catalog.json
+++ b/projects/catalog.json
@@ -1130,6 +1130,12 @@
       "href": "./ospd/collection.json",
       "type": "application/json",
       "title": "OSPD"
+    },
+    {
+      "rel": "child",
+      "href": "./4datlantic-ohc+123/collection.json",
+      "type": "application/json",
+      "title": "4DAtlantic-OHC"
     }
   ],
   "updated": "2024-09-12T20:32:23.037110Z",