Italian archaeologists say that they've found an Iberian-style helmet from between the 15th and 17th centuries. The helmet had been covered in concretions.

Could lumpy metallic rocks in the deepest, darkest reaches of the ocean be making oxygen in the absence of sunlight?

Small beads of water still trickle silently from the mammiform protuberances in the rock. We emerge from the cave to find the sea glinting in the brilliant southern light. Oddly shaped boulders ...

Researchers said that potato-sized nodules could be producing enough electrical current to split seawater into hydrogen and oxygen, a process known as electrolysis.