Well, it might be about isolation. If the story is set in a boat, the characters are likely cut off from the rest of the world. They may have to deal with their own thoughts and fears without much external help. This sense of isolation can be a strong theme.
I don't know the 'the boat full short story', so I can't say what its theme is.
One possible main theme could be identity. The marker on the side of the boat could be a symbol of the boat's identity, and by extension, the identity of those on the boat. Just as the marker makes the boat recognizable, the characters may be on a journey to discover or define who they are.
The main theme is the struggle against nature. In the 'open boat story', the men in the boat face the powerful and unforgiving sea. They have to deal with waves, storms, and the uncertainty of being rescued. Their entire existence depends on their ability to endure and find a way to safety, which shows the theme of the struggle against nature very clearly.
The main theme is perseverance. The boys in the boat faced many difficulties but they kept going.
Friendship. As they are in a boat together, they are likely to form strong bonds of friendship. They share experiences, both good and bad. They rely on each other not just physically while rowing but also emotionally. So friendship could be a main theme.
The main theme could be hope. Since it's a Christmas story and involves a boat of dreams, hope might be a central idea. The boat could represent the vehicle through which characters pursue their hopes during the Christmas season.
The main theme is perseverance. The boys faced many challenges, like tough competition and difficult training, but they never gave up.
The main theme could be about teamwork. In the story, the boys in the boat have to work together to row effectively. They need to synchronize their movements and trust each other.
The main theme is probably about teamwork and perseverance. The boys in the boat likely face various challenges and they have to work together to overcome them, showing the power of unity and the will to keep going in the face of difficulties.
The main theme is probably about teamwork and perseverance. In the story, the boys in the boat likely face various challenges and they have to work together to overcome them.