Submarine optical cable resistant to longitudinal water propagation

A submarine optical cable, comprising:

• a polymeric buffer tube;
• and
• an elongated hollow body;
• wherein the buffer tube comprises a peripheral wall,
• wherein the buffer tube further comprises at least one tubular passage,
• wherein the at least one tubular passage contains one or more optical fibers loosely housed in the at least one tubular passage,
• wherein the elongated hollow body is substantially non-deformable and hermetic,
• wherein the elongated hollow body comprises an inner surface and an outer surface,
• wherein the inner surface is disposed to longitudinally surround the buffer tube,
• wherein at least one reinforcing element longitudinally extends along an entire length of the buffer tube,
• wherein the at least one reinforcing element is embedded in the peripheral wall, and
• wherein the elongated hollow body comprises:
• an inner layer;
• and
• an outer layer;
• wherein the inner layer comprises at least one annular layer of metal wires, and
• wherein the outer layer comprises a metal tube.