Were there other early submarines besides Turtle?

Were there other early submarines besides Turtle?

Possibly: Chinese and Greco-Roman experiments are suggested, although their status depends on which accounts one accepts.

Possible Chinese and Greco-Roman experiments are suggested, with their status dependent on which accounts one accepts. Human power and metalworking are the basic requirements considered for a craft that can travel underwater or mostly underwater. Turtle and Hunley illustrate the relative simplicity of that concept. Brass or copper are suggested as materials people in earlier periods could have used.