diff --git a/libyul/CMakeLists.txt b/libyul/CMakeLists.txt
index 3d6beefee..175a443a1 100644
--- a/libyul/CMakeLists.txt
+++ b/libyul/CMakeLists.txt
@@ -52,6 +52,8 @@ add_library(yul
 	optimiser/ASTCopier.h
 	optimiser/ASTWalker.cpp
 	optimiser/ASTWalker.h
+	optimiser/BlockDeepener.cpp
+	optimiser/BlockDeepener.h
 	optimiser/BlockFlattener.cpp
 	optimiser/BlockFlattener.h
 	optimiser/BlockClassFinder.cpp
diff --git a/libyul/optimiser/BlockDeepener.cpp b/libyul/optimiser/BlockDeepener.cpp
new file mode 100644
index 000000000..0c094b21e
--- /dev/null
+++ b/libyul/optimiser/BlockDeepener.cpp
@@ -0,0 +1,47 @@
+/*
+	This file is part of solidity.
+
+	solidity is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	solidity is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#include <libyul/optimiser/BlockDeepener.h>
+#include <libyul/AsmData.h>
+#include <libdevcore/Visitor.h>
+#include <libdevcore/CommonData.h>
+#include <functional>
+
+using namespace std;
+using namespace dev;
+using namespace yul;
+
+void BlockDeepener::operator()(Block& _block)
+{
+	ASTModifier::operator()(_block);
+
+	if (_block.statements.size() <= 1)
+		return ;
+	std::vector<Statement> result;
+	std::vector<Statement> *current = &result;
+	for (std::size_t i = 0; i < _block.statements.size() - 1; ++i)
+	{
+		current->emplace_back(std::move(_block.statements[i]));
+		current->emplace_back(Block{
+			_block.location,
+			{}
+		});
+		current = &boost::get<Block>(current->back()).statements;
+	}
+	current->emplace_back(std::move(_block.statements.back()));
+
+	_block.statements = std::move(result);
+}
diff --git a/libyul/optimiser/BlockDeepener.h b/libyul/optimiser/BlockDeepener.h
new file mode 100644
index 000000000..a0521fe95
--- /dev/null
+++ b/libyul/optimiser/BlockDeepener.h
@@ -0,0 +1,31 @@
+/*
+	This file is part of solidity.
+
+	solidity is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	solidity is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#pragma once
+
+#include <libyul/optimiser/ASTWalker.h>
+
+namespace yul
+{
+
+class BlockDeepener: public ASTModifier
+{
+public:
+	using ASTModifier::operator();
+	void operator()(Block& _block) override;
+};
+
+}
diff --git a/test/libyul/YulOptimizerTest.cpp b/test/libyul/YulOptimizerTest.cpp
index fedc2ff0b..229889809 100644
--- a/test/libyul/YulOptimizerTest.cpp
+++ b/test/libyul/YulOptimizerTest.cpp
@@ -19,6 +19,7 @@
 
 #include <test/Options.h>
 
+#include <libyul/optimiser/BlockDeepener.h>
 #include <libyul/optimiser/BlockFlattener.h>
 #include <libyul/optimiser/BlockOutliner.h>
 #include <libyul/optimiser/VarDeclInitializer.h>
@@ -112,6 +113,11 @@ TestCase::TestResult YulOptimizerTest::run(ostream& _stream, string const& _line
 
 	if (m_optimizerStep == "disambiguator")
 		disambiguate();
+	else if (m_optimizerStep == "blockDeepener")
+	{
+		disambiguate();
+		BlockDeepener{}(*m_ast);
+	}
 	else if (m_optimizerStep == "blockFlattener")
 	{
 		disambiguate();
diff --git a/test/libyul/yulOptimizerTests/blockDeepener/basic.yul b/test/libyul/yulOptimizerTests/blockDeepener/basic.yul
new file mode 100644
index 000000000..776045df2
--- /dev/null
+++ b/test/libyul/yulOptimizerTests/blockDeepener/basic.yul
@@ -0,0 +1,27 @@
+{
+    let _1 := mload(0)
+    let f_a := mload(1)
+    let f_r
+    f_a := mload(f_a)
+    f_r := add(f_a, calldatasize())
+    let z := mload(2)
+}
+// ====
+// step: blockDeepener
+// ----
+// {
+//     let _1 := mload(0)
+//     {
+//         let f_a := mload(1)
+//         {
+//             let f_r
+//             {
+//                 f_a := mload(f_a)
+//                 {
+//                     f_r := add(f_a, calldatasize())
+//                     { let z := mload(2) }
+//                 }
+//             }
+//         }
+//     }
+// }
diff --git a/test/libyul/yulOptimizerTests/blockDeepener/for_stmt.yul b/test/libyul/yulOptimizerTests/blockDeepener/for_stmt.yul
new file mode 100644
index 000000000..efb88eb2d
--- /dev/null
+++ b/test/libyul/yulOptimizerTests/blockDeepener/for_stmt.yul
@@ -0,0 +1,14 @@
+{
+    for { let a := 1 } iszero(eq(a, 10)) { a := add(a, 1) }
+    { a := add(a, 1) a := add(a,1) }
+}
+// ====
+// step: blockDeepener
+// ----
+// {
+//     for { let a := 1 } iszero(eq(a, 10)) { a := add(a, 1) }
+//     {
+//         a := add(a, 1)
+//         { a := add(a, 1) }
+//     }
+// }
diff --git a/test/libyul/yulOptimizerTests/blockDeepener/if_stmt.yul b/test/libyul/yulOptimizerTests/blockDeepener/if_stmt.yul
new file mode 100644
index 000000000..5d9f1eb43
--- /dev/null
+++ b/test/libyul/yulOptimizerTests/blockDeepener/if_stmt.yul
@@ -0,0 +1,19 @@
+{
+    if add(mload(7), sload(mload(3)))
+    {
+        let y := add(mload(3), 3)
+        y := add(y, 7)
+    }
+    let t := add(3, 9)
+}
+// ====
+// step: blockDeepener
+// ----
+// {
+//     if add(mload(7), sload(mload(3)))
+//     {
+//         let y := add(mload(3), 3)
+//         { y := add(y, 7) }
+//     }
+//     { let t := add(3, 9) }
+// }
diff --git a/test/libyul/yulOptimizerTests/blockDeepener/many_nested_blocks.yul b/test/libyul/yulOptimizerTests/blockDeepener/many_nested_blocks.yul
new file mode 100644
index 000000000..8d8d319b3
--- /dev/null
+++ b/test/libyul/yulOptimizerTests/blockDeepener/many_nested_blocks.yul
@@ -0,0 +1,35 @@
+{
+    let a := 3
+    let b := 4
+    a := add(b, 3)
+    let c := 5
+    b := add(b, 4)
+    c := add(a, 5)
+    b := add(a, b)
+    a := add(a, c)
+}
+// ====
+// step: blockDeepener
+// ----
+// {
+//     let a := 3
+//     {
+//         let b := 4
+//         {
+//             a := add(b, 3)
+//             {
+//                 let c := 5
+//                 {
+//                     b := add(b, 4)
+//                     {
+//                         c := add(a, 5)
+//                         {
+//                             b := add(a, b)
+//                             { a := add(a, c) }
+//                         }
+//                     }
+//                 }
+//             }
+//         }
+//     }
+// }
diff --git a/test/libyul/yulOptimizerTests/blockDeepener/switch_stmt.yul b/test/libyul/yulOptimizerTests/blockDeepener/switch_stmt.yul
new file mode 100644
index 000000000..b3d5288c0
--- /dev/null
+++ b/test/libyul/yulOptimizerTests/blockDeepener/switch_stmt.yul
@@ -0,0 +1,31 @@
+{
+    let a := 1
+    switch calldataload(0)
+    case 0 {
+        mstore(0, 1)
+        a := 8
+    }
+    default {
+        a := 3
+        a := 4
+    }
+    a := 5
+}
+// ====
+// step: blockDeepener
+// ----
+// {
+//     let a := 1
+//     {
+//         switch calldataload(0)
+//         case 0 {
+//             mstore(0, 1)
+//             { a := 8 }
+//         }
+//         default {
+//             a := 3
+//             { a := 4 }
+//         }
+//         { a := 5 }
+//     }
+// }