In 1865, at the
conclusion of the American Civil War,
Richmond, Virginia is in ruins. The
CSS Texas, captained by Mason Tombs is loaded with the last of the
Confederacy's
gold to keep it from
Union forces before disappearing. In present day
Mali, there is a civil war between dictator General Kazim and the
Tuareg people. In Nigeria,
WHO doctors Eva Rojas and Frank Hopper investigate a disease affecting people who have been in Mali. Zakara, a corrupt Tuareg, tries to murder Eva, but she is rescued by
Dirk Pitt, from the
National Underwater and Marine Agency, who was diving nearby. Dirk gets a gold Confederate coin found in the
Niger, a clue to the location of the long-lost
Texas. He borrows his boss Sandecker's yacht to search for it. His partners Al Giordino and Rudi Gunn from NUMA accompany him. They first transport Eva and Hopper to Mali so they can continue investigating the disease, then continue up the Niger. While taking water samples, they discover red algae, which puzzles them as it is not usually found in fresh water. Kazim, with businessman Yves Massarde, try to stop the doctors from discovering the source of the disease. Kazim sends men to attack the yacht. Dirk, Al and Rudi survive, but the yacht is destroyed. Rudi leaves to get help while Dirk and Al go to rescue the doctors. Kazim's men track down the doctors and kill Hopper. Dirk and Al rescue Eva. As they are trying to leave Mali, they are captured by the Tuareg insurgents. Convincing the group that they are hunted by Kazim, their leader, Modibo, shows Eva his people dying from the disease she is following, which she determines is a waterborne toxin with no available treatment or cure. Al stumbles into a cave with a painting showing the ironclad
Texas. Dirk believes that the
Texas became stranded when the river dried up and the same river that carried the ship now runs underground. Following the river bed, they stumble upon Massarde's
solar plant, which they discover is the source of the contamination. Meanwhile, Rudi and Sandecker have deduced that chemicals are creating the red algae and seeping slowly towards the
Atlantic Ocean, where they will
expand rapidly upon entering
salt water and kill
ocean life worldwide. Despite this, the US government is reluctant to intervene. Dirk, Al and Eva infiltrate the solar power plant on an inbound train. However, Massarde and Zakara capture them, keep Eva, and send Dirk and Al in a truck to Kazim. Dirk and Al escape in the middle of the desert and rebuild a plane wreck into a
land yacht; make contact with Sandecker by telephone, they learn of the impending disaster. Dirk and Al return to the solar plant, with Modibo's help. To cover up the existence of the waste, Massarde plans to destroy it with explosives. Fearing the plant's destruction would guarantee worldwide water contamination, Al goes to remove the explosives while Dirk tries to rescue Eva. Dirk kills Zakara after a fight, but Massarde escapes via helicopter. Al successfully neutralizes the explosives. The three leave the plant in an
Avions Voisin C-28 stolen from Kazim by Modibo; the general pursues them in an
attack helicopter, with his army following. A series of explosions along the dry river bed reveals the wreckage of the
Texas. The trio hides in the armored ship, but Kazim's helicopter uses
armour-piercing ammunition. Using one of the
Texass cannons, they manage to destroy the helicopter, killing Kazim. Modibo arrives with Tuareg reinforcements, forcing Kazim's army to surrender. The plant is shut down, stopping the source of toxic waste. Sandecker agrees to work covertly for the US government in exchange for NUMA funding. The
Texas gold is left with Modibo's people. It is implied that Massarde is poisoned by Carl, an undercover
CIA agent, while Dirk and Eva start a relationship. ==Cast==