The Ichthyosaurus–Plesiosaurus Battle

The Ichthyosaurus–Plesiosaurus Battle interrupts the raft voyage across the subterranean sea with a spectacle that is at once a natural-history revelation and an immediate threat to the travelers’ lives. A mysterious impact lifts the raft from the water and sends it twenty fathoms away; soon afterward, Henry Lawson and his companions discover that the disturbance has brought them close to enormous marine creatures. Two ancient reptiles turn on one another, their struggle making the raft seem helplessly small. The Plesiosaurus dies, but the Ichthyosaurus’s fate remains unknown, so the combat offers only a temporary reprieve rather than a safe ending.

Causes and First Signs

The encounter begins at night, though the travelers’ subterranean surroundings have no true night. Hans remains at the rudder while Henry sleeps. Two hours after he falls asleep, a violent shock wakes him: the raft seems to strike a submerged rock, but instead rises clear of the water and is carried twenty fathoms away by an unexplained force. His uncle starts up, uncertain whether they have been shipwrecked. Hans points toward a large black mass, moving up and down roughly two hundred yards away.

The first impressions do not immediately clarify what the travelers are seeing. The water rises in towering columns and crashes back onto the sea, while the explorers mistake separate shapes for familiar kinds of marine animals. The extraordinary scale of the creatures turns curiosity into alarm: even the smallest, they realize, could crush the raft with a single bite. When Hans steers away from one apparent danger, the maneuver seems to take them toward another. A turtle-like bulk and a long, serpentine form appear on the opposite side, and the reptiles circle the raft, closing off escape.

The Fight and the Travelers’ Danger

For a moment the travelers expect to be attacked. Henry takes up his rifle, but the creatures’ armored bodies make its likely effect seem negligible. As the animals draw nearer, he prepares to fire; Hans stops him with a sign. The reptiles pass within fifty fathoms of the raft, then rush at each other. The travelers’ danger does not vanish, but the monsters’ attention shifts from them to their rival.

The narrator’s account first conveys the fight as bewildering spectacle. The combatants twist together so tightly that he can no longer distinguish one from the other. Their movements throw up mountains of water, spraying the raft and pitching it so violently that its occupants repeatedly fear it will overturn. Hissing reverberates against the cavern’s granite roof. The fight lasts for hours, without a clear advantage; the reptiles move away and then approach again, at times seeming about to leave the raft behind. The survivors crouch ready to fire if necessary, despite their poor prospects of wounding or frightening either animal.

Identifying the Reptiles

Professor Hardwigg interprets what the others have first perceived as an assortment of monsters. One combatant, he explains, combines the snout of a porpoise, the head of a lizard, and crocodile teeth: it is an Ichthyosaurus. The other is a Plesiosaurus, a serpentine reptile concealed beneath a hard, vaulted shell. Hans’s earlier skepticism about the additional creatures proves significant: only the two combatants are disturbing the surface of the sea. The apparent crowd of whales, crocodiles, turtles, and other horrors has been a misreading of the action, not a group of separate animals joining the battle.

The natural-history descriptions make the identification more than a passing label. The Ichthyosaurus is presented as a hundred feet long, with a great tail, an enormous jaw, and, according to the naturalists cited by the narrator, 182 teeth. Its red eyes are each as large as, or larger than, a human head. The Plesiosaurus has a cylindrical trunk, a short tail, and fins likened to the banks of oars on a Roman galley. Its neck rises more than thirty feet above the water, flexible as a swan’s. These details give the travelers’ terror a scientific vocabulary without making the animals any less formidable.

The Plesiosaurus Dies

After several hours of inconclusive struggle, the Plesiosaurus abruptly rises near the raft, wounded unto death. Only its head and immense serpent-like neck are visible. The neck whips the water and writhes in its final convulsions, sending spray across the raft and nearly blinding the travelers. Its movements weaken; the contortions cease; at last its body lies dead on the surface of the water, which has become calm and placid.

The surviving Ichthyosaurus does not appear. Henry cannot tell whether it has withdrawn to a cavern beneath the sea or may return to destroy them. The unanswered question defines the episode’s ending: the travelers have survived the immediate clash, and the dead Plesiosaurus confirms the violence of what they witnessed, but the other predator remains unaccounted for. Their breathing space is real, yet precarious—the fight has ended without turning the subterranean sea into a place of safety.