They're already masked beneath the waves, but soon these silent killers could be harder to detect - even using sonar.
American scientists have proven that a cloaking device which would render submarines and ships invisible to sonar is theoretically possible.
"We've devised a recipe for an acoustic material that would essentially open up a hole in space and make something inside that hole disappear from sound waves," said Steven Cummer, an electrical and computer engineer at Duke University in Durham, North Carolina.
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