diff --git a/nx01-x4o-fc18/src/main/java/org/x4o/fc18/zion7/FourCornerZionStenoLexer.java b/nx01-x4o-fc18/src/main/java/org/x4o/fc18/zion7/FourCornerZionStenoLexer.java
index ef1ceb3..d8a0042 100644
--- a/nx01-x4o-fc18/src/main/java/org/x4o/fc18/zion7/FourCornerZionStenoLexer.java
+++ b/nx01-x4o-fc18/src/main/java/org/x4o/fc18/zion7/FourCornerZionStenoLexer.java
@@ -24,8 +24,11 @@ package	org.x4o.fc18.zion7;
 
 import java.math.BigInteger;
 import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Iterator;
 import java.util.List;
 import java.util.Objects;
+import java.util.PrimitiveIterator;
 
 import org.x4o.fc18.cake2.FourCornerDotCake;
 import org.x4o.fc18.cake2.zero33.FCDotCDC1604DashP6;
@@ -52,6 +55,10 @@ public class FourCornerZionStenoLexer {
 	private final List<StenoScanner> scanners = new ArrayList<>(); // TODO: make static is WIP
 	private final int denominatorBank[] = new int[64]; // <== is the terminator select per 9 bit group
 	private final int numeratorBank[] = new int[denominatorBank.length];
+	private final List<Integer> sandwormHead = new ArrayList<>();
+	private boolean sandwormSign = false;
+	private int sandwormSignLine = 0;
+	private int sandwormSignColumn = 0;
 	private List<Integer> input;
 	private int inputIndex = 0;
 	private int currLine = 0;
@@ -163,6 +170,9 @@ public class FourCornerZionStenoLexer {
 				smokeSignals.burnUnsupported(currLine, currCol, input.get(inputIndex));
 			}
 		}
+		if (sandwormSign) {
+			smokeSignals.burnSandWormSignUnused(sandwormSignLine, sandwormSignColumn);
+		}
 		handlerDocument.strobeDocumentOmega();
 	}
 	
@@ -283,12 +293,54 @@ public class FourCornerZionStenoLexer {
 	
 	static class StenoScannerSandOlgoi extends StenoScanner {
 		
+		private static final List<Integer> WORM_SIGN = List.of(24,48,96,192);// TODO: add missing here + cake doc as it grows per 72 bit slug
+		
 		public StenoScannerSandOlgoi() {
 			super(FourCornerDotCake.FC_SAND_OLGOI);
 		}
 		
 		@Override
 		public void process(FourCornerZionStenoLexer lexer, int idxFirst, int idxLast) {
+			if (lexer.sandwormSign) {
+				lexer.smokeSignals.burnSandWormSignUnused(lexer.sandwormSignLine, lexer.sandwormSignColumn);
+			}
+			int bitIdxLast = 0;
+			int[] sandWalking = new int[576];
+			for (int i = idxFirst; i <= idxLast; i++) {
+				int bitIdx = lexer.input.get(i);
+				if (bitIdx < bitIdxLast) {
+					lexer.smokeSignals.burnSandWormSignOutOfOrder(lexer.currLine, lexer.currCol);
+					return;
+				}
+				bitIdxLast = bitIdx;
+				int bitOff = bitIdx - FourCornerDotCake.FC_SAND_OLGOI.getStart();
+				sandWalking[bitOff] = 1;
+			}
+			lexer.sandwormHead.clear();
+			PrimitiveIterator.OfInt i = Arrays.stream(sandWalking).iterator();
+			int octalIdx = 2;
+			int octalValue = 0;
+			while (i.hasNext()) {
+				int bitValue = i.nextInt();
+				octalValue += bitValue << octalIdx;
+				if (octalIdx > 0) {
+					octalIdx--;
+					continue;
+				}
+				lexer.sandwormHead.add(octalValue);
+				octalIdx = 2;
+				octalValue = 0;
+			}
+			int wormHeadSize = lexer.sandwormHead.size();
+			if (WORM_SIGN.contains(wormHeadSize)) {
+				lexer.sandwormSign = true;
+				lexer.sandwormSignLine = lexer.currLine;
+				lexer.sandwormSignColumn = lexer.currCol;
+				lexer.fireSignals.fireStateSandWormSign(wormHeadSize);
+				return; // Sand walking signal pulses have been stamped correctly to call the worm
+			}
+			lexer.sandwormHead.clear();
+			lexer.smokeSignals.burnSandWormSignIncorrect(lexer.currLine, lexer.currCol, wormHeadSize);
 		}
 	}
 	
@@ -300,11 +352,42 @@ public class FourCornerZionStenoLexer {
 		
 		@Override
 		public void process(FourCornerZionStenoLexer lexer, int idxFirst, int idxLast) {
-		}
-		
-		private void handlePoints(FourCornerZionStenoLexer lexer, List<Integer> slicedPoints) {
-			// TODO: convert from 15 bit to 3 bit
-			lexer.handler.strobeSandWorm(null, slicedPoints);
+			lexer.sandwormSign = false;
+			List<Integer> wormBody15 = new ArrayList<>();
+			for (int i = idxFirst; i <= idxLast; i++) {
+				wormBody15.add(lexer.input.get(i));
+			}
+			List<Integer> wormBody = new ArrayList<>();
+			Iterator<Integer> i15 = wormBody15.iterator();
+			while (i15.hasNext()) {
+				int bitValue15 = i15.next();
+				int octal4 = 0;
+				int octal3 = 0;
+				int octal2 = 0;
+				int octal1 = 0;
+				int octal0 = 0;
+				octal4 += (bitValue15 >> 14) & 0b1;
+				octal4 += (bitValue15 >> 13) & 0b1;
+				octal4 += (bitValue15 >> 12) & 0b1;
+				octal3 += (bitValue15 >> 11) & 0b1;
+				octal3 += (bitValue15 >> 10) & 0b1;
+				octal3 += (bitValue15 >> 9) & 0b1;
+				octal2 += (bitValue15 >> 8) & 0b1;
+				octal2 += (bitValue15 >> 7) & 0b1;
+				octal2 += (bitValue15 >> 6) & 0b1;
+				octal1 += (bitValue15 >> 5) & 0b1;
+				octal1 += (bitValue15 >> 4) & 0b1;
+				octal1 += (bitValue15 >> 3) & 0b1;
+				octal0 += (bitValue15 >> 2) & 0b1;
+				octal0 += (bitValue15 >> 1) & 0b1;
+				octal0 += (bitValue15 >> 0) & 0b1;
+				wormBody.add(octal4);
+				wormBody.add(octal3);
+				wormBody.add(octal2);
+				wormBody.add(octal1);
+				wormBody.add(octal0);
+			}
+			lexer.handler.strobeSandWorm(lexer.sandwormHead, wormBody);
 		}
 	}
 	
diff --git a/nx01-x4o-fc18/src/main/java/org/x4o/fc18/zion7/FourCornerZionStenoLexerFire.java b/nx01-x4o-fc18/src/main/java/org/x4o/fc18/zion7/FourCornerZionStenoLexerFire.java
index cb6ea6d..7ee8805 100644
--- a/nx01-x4o-fc18/src/main/java/org/x4o/fc18/zion7/FourCornerZionStenoLexerFire.java
+++ b/nx01-x4o-fc18/src/main/java/org/x4o/fc18/zion7/FourCornerZionStenoLexerFire.java
@@ -38,6 +38,8 @@ public interface FourCornerZionStenoLexerFire {
 	
 	void fireStateNCR1632BankReset(boolean magic);
 	
+	void fireStateSandWormSign(int size);
+	
 	interface Adapter extends FourCornerZionStenoLexerFire {
 		
 		@Override
@@ -59,5 +61,9 @@ public interface FourCornerZionStenoLexerFire {
 		@Override
 		default void fireStateNCR1632BankReset(boolean magic) {
 		}
+		
+		@Override
+		default void fireStateSandWormSign(int size) {
+		}
 	}
 }
diff --git a/nx01-x4o-fc18/src/main/java/org/x4o/fc18/zion7/FourCornerZionStenoLexerSmoke.java b/nx01-x4o-fc18/src/main/java/org/x4o/fc18/zion7/FourCornerZionStenoLexerSmoke.java
index 4bd9d68..abe5e95 100644
--- a/nx01-x4o-fc18/src/main/java/org/x4o/fc18/zion7/FourCornerZionStenoLexerSmoke.java
+++ b/nx01-x4o-fc18/src/main/java/org/x4o/fc18/zion7/FourCornerZionStenoLexerSmoke.java
@@ -41,6 +41,13 @@ public interface FourCornerZionStenoLexerSmoke {
 	void burnUNI21UnusedBigIndian(int line, int col);
 	
 	
+	void burnSandWormSignOutOfOrder(int line, int col);
+	
+	void burnSandWormSignIncorrect(int line, int col, int size);
+	
+	void burnSandWormSignUnused(int line, int col);
+	
+	
 	interface Adapter extends FourCornerZionStenoLexerSmoke {
 		
 		@Override
@@ -62,5 +69,17 @@ public interface FourCornerZionStenoLexerSmoke {
 		@Override
 		default void burnUNI21UnusedBigIndian(int line, int col) {
 		}
+		
+		@Override
+		default void burnSandWormSignOutOfOrder(int line, int col) {
+		}
+		
+		@Override
+		default void burnSandWormSignIncorrect(int line, int col, int size) {
+		}
+		
+		@Override
+		default void burnSandWormSignUnused(int line, int col) {
+		}
 	}
 }