diff --git a/core/assets/maps/lake.msav b/core/assets/maps/lake.msav
new file mode 100644
index 0000000000..da7acda1fa
Binary files /dev/null and b/core/assets/maps/lake.msav differ
diff --git a/core/src/mindustry/content/ErekirTechTree.java b/core/src/mindustry/content/ErekirTechTree.java
index c3e369bb3b..97448bc25f 100644
--- a/core/src/mindustry/content/ErekirTechTree.java
+++ b/core/src/mindustry/content/ErekirTechTree.java
@@ -289,7 +289,7 @@ public class ErekirTechTree{
 
                 });
 
-                node(shipFabricator, Seq.with(new OnSector(two)), () -> {
+                node(shipFabricator, Seq.with(new OnSector(lake)), () -> {
                     node(UnitTypes.elude);
 
                     node(mechFabricator, Seq.with(new OnSector(three)), () -> {
@@ -342,10 +342,13 @@ public class ErekirTechTree{
                 });
             });
 
-            //TODO more sectors
             node(onset, () -> {
                 node(two, Seq.with(new SectorComplete(onset), new Research(ductRouter), new Research(ductBridge)), () -> {
-                    node(three, Seq.with(new SectorComplete(two), new Research(ventCondenser), new Research(shipFabricator)), () -> {
+                    node(lake, Seq.with(new SectorComplete(two)), () -> {
+
+                    });
+
+                    node(three, Seq.with(new SectorComplete(two), new SectorComplete(lake), new Research(ventCondenser), new Research(shipFabricator)), () -> {
                         node(four, Seq.with(new SectorComplete(three)), () -> {
 
                         });
diff --git a/core/src/mindustry/content/SectorPresets.java b/core/src/mindustry/content/SectorPresets.java
index 9260b99e68..f635257929 100644
--- a/core/src/mindustry/content/SectorPresets.java
+++ b/core/src/mindustry/content/SectorPresets.java
@@ -16,7 +16,7 @@ public class SectorPresets{
     impact0078, desolateRift, nuclearComplex, planetaryTerminal,
     coastline, navalFortress,
 
-    onset, two, three, four
+    onset, two, lake, three, four
     ;
 
     public static void load(){
@@ -198,6 +198,11 @@ public class SectorPresets{
             };
         }};
 
+        lake = new SectorPreset("lake", erekir, 41){{
+            difficulty = 4;
+
+        }};
+
         three = new SectorPreset("three", erekir, 36){{
             difficulty = 5;