Something happened on land within a few hours of Estrella Polar leaving port, and an unforeseen storm has rendered the navigation systems useless.
The youngest crewmembers enjoy their first day onboard, oblivious to the magnitude of the problems they face. The adults desperately seek answers.
The captain tries to keep the ship on course, but things get a bit more complicated when a passenger plane crashes a few meters from the boat.
As desolation and fear take over the crew's spirit, Julia tries to give them hope: According to her calculations, they should hit land at some point.
More than 40,000 exhausted and hungry birds flew from the cataclysm and are seeking land on which to rest and feed -- and they're headed for the boat.
As meager rations take a toll on the crew, Gamboa calls the captain's leadership into question and proposes a vote over who takes charge of the ship.
It’s 9:00 a.m., the alarms sound and the ship begins to come to life, but something isn't right: No light enters through the windows, only darkness.
The discovery of an island gives the crew new hope, though finding it may take years. Piti, Ramiro and Palomares go fishing and snag something huge.
De la Cuadra and the captain manage to find a ship the radar detected a few hours earlier, and soon notice something is amiss on the small yacht.
Burbuja gets a bad feeling when he spots a thick fog on the horizon -- it appeared suddenly and produces an echo. Then, the captain's daughter faints.
Gamboa is still missing and presumed dead. Most assume he fell into the sea, but Ramiro is convinced Ulises murdered him and threw him overboard.
Burbuja finds a travel log written by the Estrella Polar's first captain, chronicling the arrival of a strange passenger: the man from Liverpool.
After missing for several days, Gamboa reappears in surprisingly good shape. At the same time, all mobile devices strangely begin to function again.
Burbuja is harboring information he gleaned from secretly monitoring his duck's movements -- and that's not the only critical information he's hiding.
The crew get news they've been waiting for: Land has been sighted, or more precisely, a beacon. But when they get close, the light suddenly goes out.
Estrella Polar is about to crash into another submarine that's been following them -- at least, that’s what the crew think they see through the haze.
The ship's crew realize they're sailing over a city buried underneath the sea and rescue 193 survivors who climbed to the top of the skyscrapers.
The hotel’s inhabitants take Estrella Polar by force. Meanwhile, Julia and the captain are locked in an elevator that is slowly flooding.
The captain must decide who among the crew will stay behind in the hotel while they search for land. Also, he and Julia announce that they will marry.
Gamboa tries to dissuade Julia from marrying the captain, but she stands resolute, even though marriage between crewmembers is strictly forbidden.
Sol reveals to Piti that she's never spent the night with anyone. She's also worried Gamboa's figured out that Sol is actually her twin sister, Elena.
As everyone looks for Sol, Gamboa tries to convince them that the youngsters took one of the life rafts. Salomé and Cho Sung find two new stowaways.
After 132 days at sea, the Estrella Polar finally sights land, and a small expedition sets out to make sure that this new territory is safe.
In his last dispatch from the building, Ulises informed everyone that they were being attacked. The Estrella Polar is quickly sent to the building.
The kids manage to prove what they suspected: They aren’t alone on the island. Two people with gas masks shot at them while they were rescuing Vilma.
The captain and Palomares hear a strange and unsettling sound in the ship’s bow. Ainhoa and Piti explore the island and find an abandoned cabin.
Missing for several days, Max has reappeared injured near the cabin. He decides to tell Ainhoa and Piti about the sinister message from another ship.
The crew are being attacked in the cabin; their attackers want the red folder, and the captain is not willing to have them die over a few papers.
As Ulises and Ainhoa communicate by walkie talkie, Ainhoa has a feeling Ulises will never return to her. Meanwhile, Gamboa is pointing a gun at them.
The crew manage to contact astronauts of the International Space Station, who plan to touch down near the ship -- just as a cyclone will pass through.
The crew sails into an enormous, seemingly unthreatening patch of kelp that soon reproduces uncontrollably throughout the ship, causing it to sink.
When a drifting watercraft bearing the name Queen América appears, the crew rescues some of the belongings that accompany it, including boxes of food.
Strange grayish larvae are jamming all the pipes and drains of the Estrella Polar -- which means something is nesting throughout the ship.
Valeria is certain the newcomers are hiding something. Ulises is suspicious of them, too -- he's sure Víctor hid something in the dirty woven basket.
An enormous waterfall is dragging the ship down. Julia confesses more ships belonging to Proyecto Alejandría exist, so there must be more survivors.
Estrella Polar is approaching a waterfall, so Burbuja decides to throw himself over the waterfall in a wooden barrel in order to estimate its height.
Ulises is unconscious in the water and in dire need of rescue. Palomares believes he's betrayed all that he swore to defend, his faith and God.
All electronic devices suddenly ceased functioning in the middle of the night, leaving the ship's crew with no light, radio, radar, or rudder control.
The duck that the crew encountered has come from dry land, so as long as the magnetic field is normalized, it could guide them back home.
A young stowaway is discovered on the ship, and someone has connected the rudder to a homemade bomb that will detonate if the ship changes course.
The crew is puzzled when they come across a ship identical in shape and size to Estrella Polar. It's even more suspicious that it has the same name.
Animated by the music coming from the bottom of the dining room, the youngest members of the ship begin to sing and dance, and soon everyone joins in.
The crew do their best to ensure that Valeria has a great Christmas, attempting to get everything she asked for and even making some things by hand.