diff --git a/core/assets/bundles/bundle.properties b/core/assets/bundles/bundle.properties
index aca79aead7..5978f70ed8 100644
--- a/core/assets/bundles/bundle.properties
+++ b/core/assets/bundles/bundle.properties
@@ -925,7 +925,7 @@ sector.frontier.description = WIP, map submission by Stormride_R
 sector.infestedCanyons.description = WIP, map submission by Skeledragon
 sector.polarAerodrome.description = WIP, map submission by hhh i 17
 sector.testingGrounds.description = WIP, map submission by dnx2019
-sector.seaPort.description = WIP, map submission by inkognito626
+sector.perilousHarbor.description = WIP, map submission by inkognito626
 sector.weatheredChannels.description = WIP, map submission by Skeledragon
 sector.fallenVessel.description = WIP, map submission
 sector.mycelialBastion.description = WIP, map submission by Skeledragon
@@ -2167,8 +2167,6 @@ frontier.tutorial2 = Enemy waves send [accent]infinitely[] until all enemy cores
 frontier.tutorial3 = [accent]Attack the enemy base fast to prevent waves from getting too high[].
 
 atolls.destroy1 = Destroy the 2 enemy [accent]foundation cores[] first.\n[accent]Gain access to thorium[].
-atolls.destroy2 = The enemy base to the south is fragile to naval units. \nConstruct [accent]naval units[]   to proceed.
-atolls.destroy3 = The enemy base to the east is fragile to air units. \nConstruct [accent]air units[]   to proceed.
 atolls.mega1 = Enter [accent]command mode[] and select the :mega:[accent]Mega[] units.
 atolls.mega2 = Select the  [accent]Load Units[] command to have Mega units to pick up ground units.
 atolls.mega3 = Move the Mega units [accent]above[] ground units to load them in.
diff --git a/core/assets/maps/atolls.msav b/core/assets/maps/atolls.msav
index 8081a6ed44..3057bcfe1d 100644
Binary files a/core/assets/maps/atolls.msav and b/core/assets/maps/atolls.msav differ
diff --git a/core/assets/maps/extractionOutpost.msav b/core/assets/maps/extractionOutpost.msav
index 34be21a803..3a26bbadc6 100644
Binary files a/core/assets/maps/extractionOutpost.msav and b/core/assets/maps/extractionOutpost.msav differ
diff --git a/core/assets/sounds/ui/waveSpawn.ogg b/core/assets/sounds/ui/waveSpawn.ogg
index 5b69169a8c..5b507ab40a 100644
Binary files a/core/assets/sounds/ui/waveSpawn.ogg and b/core/assets/sounds/ui/waveSpawn.ogg differ
diff --git a/core/src/mindustry/content/SerpuloTechTree.java b/core/src/mindustry/content/SerpuloTechTree.java
index 9933c12658..649aabf1e4 100644
--- a/core/src/mindustry/content/SerpuloTechTree.java
+++ b/core/src/mindustry/content/SerpuloTechTree.java
@@ -668,14 +668,15 @@ public class SerpuloTechTree{
                                         new SectorComplete(windsweptIslands),
                                         new SectorComplete(perilousHarbor),
                                         new SectorComplete(facility32m),
-                                        new Research(groundFactory),
-                                        new Research(nova),
-                                        new Research(airFactory),
-                                        new Research(mono)
+
+                                        new Research(multiplicativeReconstructor),
+                                        new Research(risso),
+                                        new Research(minke),
+                                        new Research(fortress)
                                         ), () -> {
                                             node(atolls, Seq.with(
                                             new SectorComplete(extractionOutpost),
-                                            new Research(multiplicativeReconstructor),
+                                            new Research(poly),
                                             new Research(mega)
                                             ), () -> {
 
diff --git a/core/src/mindustry/ui/fragments/HintsFragment.java b/core/src/mindustry/ui/fragments/HintsFragment.java
index 630c58780a..62110d9a09 100644
--- a/core/src/mindustry/ui/fragments/HintsFragment.java
+++ b/core/src/mindustry/ui/fragments/HintsFragment.java
@@ -281,12 +281,14 @@ public class HintsFragment{
             && state.rules.defaultTeam.core() != null
             && state.rules.defaultTeam.core().block == Blocks.coreShard
             && state.rules.defaultTeam.core().items.has(Blocks.coreFoundation.requirements),
-            () -> ui.hints.placedBlocks.contains(Blocks.coreFoundation)),
+            () -> ui.hints.placedBlocks.contains(Blocks.coreFoundation)
+        ),
 
         serpuloCoreZone(
             () -> state.isCampaign() && state.getPlanet() == Planets.serpulo && Vars.indexer.isBlockPresent(Blocks.coreZone) &&
                 (!state.rules.attackMode || state.stats.getDestroyed(Blocks.coreShard) + state.stats.getDestroyed(Blocks.coreFoundation) + state.stats.getDestroyed(Blocks.coreNucleus) > 0),
-            () -> state.rules.defaultTeam.cores().size > 1),
+            () -> state.rules.defaultTeam.cores().size > 1
+        ),
 
         presetLaunch(
             () -> state.isCampaign() && state.getSector().preset == null,