Jotaro and the others obtain a submarine as a new means of travel. Through the Red Sea, they try to head toward Egypt where DIO awaits. Using the sonar to detect any threats on the outside, the submarine quietly dives in. They however realize that if they're attacked underwater, there is nowhere to escape, so they are on their guard. Finally, when they are about to surface, a coffee mug that was in the cabin transforms and cuts off Joseph's artificial hand.
It uses reflected sound waves
يستخدم الأمواج الصوتية
Durch Schallwellen
Utiliza el eco de las ondas sonoras
 para detectar objetos en el agua.
Utiliza el eco de las ondas sonoras
 para detectar objetos en el agua.
Sfrutta il suono riflesso delle onde,
É como um radar de ondas sonoras,