Strangely, a victim's scream could be heard through the thickest of metals. All infected could also emit terrifying high-pitched screams that sounded like tortured metal, capable of cracking open ice, and communicating with other infected victims.
( COMIC: The Wolves of Winter) Alternately, human victims could no longer speak English, but could emit gurgling growls and snarls and could seemingly only understand Ancient North Martian. When infecting Ice Warriors, it could communicate verbally once infection manifested itself. The Flood proved capable of coordinated action despite being scattered, as well as considerable intelligence. This weakness was shared with those who imprisoned them, the Ice Warriors. However, the Flood creatures, being made almost entirely up of water and constantly producing it, could be destroyed by intensive heat. Despite the considerable amount of water produced by the infection, the infected did not seem to be overly affected by electricity (which salty water conducts well) the infected Andy Stone was electrocuted by the Tenth Doctor, but was only momentarily incapacitated. A single droplet of the viral water emitted by the host could pass on the infection to another host. Hosts could also run extremely fast, even going as far as to keep up with a rocket-powered robot and outrun other running people. The host also had the ability to survive on the surface of Mars. These physical symptoms could be masked, meaning that the infection could hide inside a human host, and infect him or her at any moment. The Tenth Doctor suggested that this might mean they were closer to human than those with the faded blue eyes. Some hosts, though not all, could develop faded blue eyes.
When infected, the hosts would also develop cracked skin (especially around the mouth and neck) and blackened teeth, as well as an internal fission in the host's body that produced the water. Upon mutation, infected victims could deactivate nearby cameras. The infection caused a lot of electrical activity in the host's brain. The infected victims would no longer draw their oxygen from air, but from water and they would be near walking corpses, as the infection greatly weakened their heartbeats and pulse. This could be increased to produce high-pressure sprays from both the hands and the mouth. Once infected, the individual constantly exuded water, pouring from the body hands and mouth. It was also capable of infecting other life forms by coming into contact with them, making them spasm and convulse as they were taken over, mainly because it was a viral life-form. It was capable of controlling the water, causing it to flow in unnatural directions. The Flood's natural state was in liquid water.