diff --git a/libs/s25main/GamePlayer.cpp b/libs/s25main/GamePlayer.cpp
index 17d9b099d..4276bf727 100644
--- a/libs/s25main/GamePlayer.cpp
+++ b/libs/s25main/GamePlayer.cpp
@@ -1426,6 +1426,10 @@ void GamePlayer::Surrender()
     if(isDefeated)
         return;
 
+    const auto shipsCopy = ships; // copy to avoid modification during iteration
+    for(auto* ship : shipsCopy)
+        ship->Sink();
+
     isDefeated = true;
 
     // GUI Bescheid sagen
@@ -1897,17 +1901,10 @@ bool GamePlayer::OrderShip(nobHarborBuilding& hb)
     return (false);
 }
 
-/// Meldet das Schiff wieder ab
-void GamePlayer::RemoveShip(noShip* ship)
+void GamePlayer::RemoveShip(noShip& ship)
 {
-    for(unsigned i = 0; i < ships.size(); ++i)
-    {
-        if(ships[i] == ship)
-        {
-            ships.erase(ships.begin() + i);
-            return;
-        }
-    }
+    RTTR_Assert(helpers::contains(ships, &ship));
+    helpers::erase(ships, &ship);
 }
 
 /// Versucht, für ein untätiges Schiff eine Arbeit zu suchen
diff --git a/libs/s25main/GamePlayer.h b/libs/s25main/GamePlayer.h
index 922c62ba8..a2804e389 100644
--- a/libs/s25main/GamePlayer.h
+++ b/libs/s25main/GamePlayer.h
@@ -114,7 +114,7 @@ class GamePlayer : public GamePlayerInfo
     /// Returns true if the given wh does still exist and hence the ptr is valid
     bool IsWarehouseValid(nobBaseWarehouse* wh) const;
     /// Gibt erstes Lagerhaus zurück
-    nobBaseWarehouse* GetFirstWH()
+    nobBaseWarehouse* GetFirstWH() const
     {
         return buildings.GetStorehouses().empty() ? nullptr : buildings.GetStorehouses().front();
     }
@@ -234,7 +234,7 @@ class GamePlayer : public GamePlayerInfo
     /// Registriert ein Schiff beim Einwohnermeldeamt
     void RegisterShip(noShip& ship);
     /// Meldet das Schiff wieder ab
-    void RemoveShip(noShip* ship);
+    void RemoveShip(noShip& ship);
     /// Versucht, für ein untätiges Schiff eine Arbeit zu suchen
     void GetJobForShip(noShip& ship);
     /// Schiff für Hafen bestellen. Wenn ein Schiff kommt, true.
diff --git a/libs/s25main/buildings/nobHarborBuilding.cpp b/libs/s25main/buildings/nobHarborBuilding.cpp
index 7f829e1fe..11f5e81c0 100644
--- a/libs/s25main/buildings/nobHarborBuilding.cpp
+++ b/libs/s25main/buildings/nobHarborBuilding.cpp
@@ -441,8 +441,7 @@ void nobHarborBuilding::StopExplorationExpedition()
 /// Bestellt die zusätzlichen erforderlichen Waren für eine Expedition
 void nobHarborBuilding::OrderExpeditionWares()
 {
-    RTTR_Assert(!IsBeingDestroyedNow()); // Wares should already be canceled!
-    if(this->IsBeingDestroyedNow())      // don't order new stuff if we are about to be destroyed
+    if(IsBeingDestroyedNow()) // don't order new stuff if we are about to be destroyed
         return;
 
     if(!expedition.active) // expedition no longer active?
@@ -496,11 +495,8 @@ void nobHarborBuilding::OrderExpeditionWares()
         orderware_ev = GetEvMgr().AddEvent(this, 210, 10);
 }
 
-/// Eine bestellte Ware konnte doch nicht kommen
 void nobHarborBuilding::WareLost(Ware& ware)
 {
-    RTTR_Assert(!IsBeingDestroyedNow());
-    // ggf. neue Waren für Expedition bestellen
     if(expedition.active && (ware.type == GoodType::Boards || ware.type == GoodType::Stones))
         OrderExpeditionWares();
     nobBaseWarehouse::WareLost(ware);
diff --git a/libs/s25main/nodeObjs/noShip.cpp b/libs/s25main/nodeObjs/noShip.cpp
index 5a3fec80c..0fe4c9f00 100644
--- a/libs/s25main/nodeObjs/noShip.cpp
+++ b/libs/s25main/nodeObjs/noShip.cpp
@@ -1,4 +1,4 @@
-// Copyright (C) 2005 - 2021 Settlers Freaks (sf-team at siedler25.org)
+// Copyright (C) 2005 - 2026 Settlers Freaks (sf-team at siedler25.org)
 //
 // SPDX-License-Identifier: GPL-2.0-or-later
 
@@ -104,7 +104,7 @@ void noShip::Destroy()
     RTTR_Assert(wares.empty());
     world->GetNotifications().publish(ShipNote(ShipNote::Destroyed, ownerId_, pos));
     // Schiff wieder abmelden
-    world->GetPlayer(ownerId_).RemoveShip(this);
+    world->GetPlayer(ownerId_).RemoveShip(*this);
 }
 
 void noShip::Draw(DrawPoint drawPt)
@@ -1230,3 +1230,25 @@ void noShip::NewHarborBuilt(nobHarborBuilding* hb)
             break;
     }
 }
+
+void noShip::Sink()
+{
+    for(auto& figure : figures)
+    {
+        figure->Abrogate();
+        figure->SetGoalTonullptr();
+        figure->RemoveFromInventory();
+    }
+    figures.clear();
+
+    for(auto& ware : wares)
+    {
+        ware->WareLost(ownerId_);
+        ware->Destroy();
+    }
+    wares.clear();
+
+    GetEvMgr().RemoveEvent(current_ev);
+    GetEvMgr().AddToKillList(world->RemoveFigure(pos, *this));
+    world->RecalcVisibilitiesAroundPoint(pos, GetVisualRange(), ownerId_, nullptr);
+}
diff --git a/libs/s25main/nodeObjs/noShip.h b/libs/s25main/nodeObjs/noShip.h
index bf154146f..5f8999e7f 100644
--- a/libs/s25main/nodeObjs/noShip.h
+++ b/libs/s25main/nodeObjs/noShip.h
@@ -1,4 +1,4 @@
-// Copyright (C) 2005 - 2021 Settlers Freaks (sf-team at siedler25.org)
+// Copyright (C) 2005 - 2026 Settlers Freaks (sf-team at siedler25.org)
 //
 // SPDX-License-Identifier: GPL-2.0-or-later
 
@@ -223,4 +223,7 @@ class noShip : public noMovable
     void HarborDestroyed(nobHarborBuilding* hb);
     /// Sagt dem Schiff, dass ein neuer Hafen erbaut wurde
     void NewHarborBuilt(nobHarborBuilding* hb);
+
+    /// Destroy the ship immediately
+    void Sink();
 };
diff --git a/tests/s25Main/integration/testSeafaring.cpp b/tests/s25Main/integration/testSeafaring.cpp
index e2d6e507f..d801f3f0d 100644
--- a/tests/s25Main/integration/testSeafaring.cpp
+++ b/tests/s25Main/integration/testSeafaring.cpp
@@ -1,4 +1,4 @@
-// Copyright (C) 2005 - 2021 Settlers Freaks (sf-team at siedler25.org)
+// Copyright (C) 2005 - 2026 Settlers Freaks (sf-team at siedler25.org)
 //
 // SPDX-License-Identifier: GPL-2.0-or-later
 
@@ -718,4 +718,73 @@ BOOST_FIXTURE_TEST_CASE(AddWareWithUnreachableGoalToHarbor, ShipAndHarborsReadyF
     BOOST_TEST(MockWare::destroyed);
 }
 
+BOOST_FIXTURE_TEST_CASE(SinkShipLoosesCargo, ShipAndHarborsReadyFixture<1>)
+{
+    const GamePlayer& player = world.GetPlayer(curPlayer);
+    noShip& ship = *player.GetShipByID(0);
+
+    const auto& harbors = player.GetBuildingRegister().GetHarbors();
+    BOOST_TEST_REQUIRE(harbors.size() >= 2u);
+    nobHarborBuilding& harbor1 = *harbors.front();
+    nobHarborBuilding& harbor2 = **(++harbors.begin());
+
+    // Transport something
+    BOOST_TEST_REQUIRE(harbor1.OrderJob(Job::Woodcutter, harbor2, false));
+    BOOST_TEST_REQUIRE(harbor1.OrderWare(GoodType::Wood, harbor2));
+    BOOST_TEST_REQUIRE(harbor1.OrderWare(GoodType::Wood, harbor2));
+
+    RTTR_EXEC_TILL(90, ship.IsLoading());
+    RTTR_EXEC_TILL(200, ship.IsMoving());
+    BOOST_TEST(ship.GetWares().size() == 2u);
+    BOOST_TEST(ship.GetFigures().size() == 1u);
+
+    const auto shipPos = ship.GetPos();
+    BOOST_TEST_REQUIRE(player.GetNumShips() == 1u);
+    BOOST_TEST_REQUIRE(world.GetFigures(shipPos).size() == 1u);
+    BOOST_TEST_REQUIRE(dynamic_cast<noShip*>(&world.GetFigures(shipPos).front()));
+
+    const auto numWood = player.GetInventory()[GoodType::Wood];
+    const auto numWoodcutters = player.GetInventory()[Job::Woodcutter];
+    ship.Sink();
+    RTTR_SKIP_GFS(1); // Handle delayed destruction
+    BOOST_TEST(player.GetNumShips() == 0u);
+    BOOST_TEST(world.GetFigures(shipPos).size() == 0u);
+    BOOST_TEST(player.GetInventory()[GoodType::Wood] == numWood - 2);
+    BOOST_TEST(player.GetInventory()[Job::Woodcutter] == numWoodcutters - 1);
+}
+
+BOOST_FIXTURE_TEST_CASE(RemoveShipsOnDefeat, ShipAndHarborsReadyFixture<2>)
+{
+    const GamePlayer& player = world.GetPlayer(curPlayer);
+    const noShip& ship = *player.GetShipByID(0);
+
+    const auto& harbors = player.GetBuildingRegister().GetHarbors();
+    BOOST_TEST_REQUIRE(harbors.size() >= 2u);
+    nobHarborBuilding& harbor1 = *harbors.front();
+    nobHarborBuilding& harbor2 = **(++harbors.begin());
+
+    // Transport something
+    BOOST_TEST_REQUIRE(harbor1.OrderJob(Job::Woodcutter, harbor2, false));
+    BOOST_TEST_REQUIRE(harbor1.OrderWare(GoodType::Wood, harbor2));
+
+    RTTR_EXEC_TILL(90, ship.IsLoading());
+    RTTR_EXEC_TILL(200, ship.IsMoving());
+    const auto numWood = ship.GetWares().size();
+    const auto numWoodcutters = ship.GetFigures().size();
+    BOOST_TEST(numWood == 1u);
+    BOOST_TEST(numWoodcutters == 1u);
+
+    const auto shipPos = ship.GetPos();
+    BOOST_TEST_REQUIRE(player.GetNumShips() == 1u);
+    BOOST_TEST_REQUIRE(world.GetFigures(shipPos).size() == 1u);
+    BOOST_TEST_REQUIRE(dynamic_cast<noShip*>(&world.GetFigures(shipPos).front()));
+    const auto warehouses = player.GetBuildingRegister().GetStorehouses(); // Copy for iteration
+    for(const auto* bld : warehouses)
+        world.DestroyBuilding(bld->GetPos(), curPlayer);
+    RTTR_SKIP_GFS(1); // Handle delayed destruction
+    BOOST_TEST(player.IsDefeated());
+    BOOST_TEST(player.GetNumShips() == 0u);
+    BOOST_TEST(world.GetFigures(shipPos).size() == 0u);
+}
+
 BOOST_AUTO_TEST_SUITE_END()
diff --git a/tests/s25Main/worldFixtures/TestEventManager.cpp b/tests/s25Main/worldFixtures/TestEventManager.cpp
index 49a02e676..e12213abb 100644
--- a/tests/s25Main/worldFixtures/TestEventManager.cpp
+++ b/tests/s25Main/worldFixtures/TestEventManager.cpp
@@ -1,4 +1,4 @@
-// Copyright (C) 2005 - 2021 Settlers Freaks (sf-team at siedler25.org)
+// Copyright (C) 2005 - 2026 Settlers Freaks (sf-team at siedler25.org)
 //
 // SPDX-License-Identifier: GPL-2.0-or-later
 
@@ -9,22 +9,18 @@ unsigned TestEventManager::ExecuteNextEvent(unsigned maxGF)
 {
     if(GetCurrentGF() >= maxGF)
         return 0;
-    if(events.empty())
+    unsigned numGFs;
+    if(events.empty() || events.begin()->first > maxGF)
     {
-        unsigned numGFs = maxGF - GetCurrentGF();
+        numGFs = maxGF - GetCurrentGF();
         currentGF = maxGF;
-        return numGFs;
-    }
-    auto itEvents = events.begin();
-    if(itEvents->first > maxGF)
+    } else
     {
-        unsigned numGFs = maxGF - GetCurrentGF();
-        currentGF = maxGF;
-        return numGFs;
+        auto itEvents = events.begin();
+        numGFs = itEvents->first - GetCurrentGF();
+        currentGF = itEvents->first;
+        ExecuteEvents(itEvents);
     }
-    unsigned numGFs = itEvents->first - GetCurrentGF();
-    currentGF = itEvents->first;
-    ExecuteEvents(itEvents);
     DestroyCurrentObjects();
     return numGFs;
 }