The themes in the novel Dark Isle by DA Nelson are:

1. Friendship and loyalty
2. Overcoming fear and adversity
3. The power of nature and the environment
4. The importance of family and community
5. The consequences of greed and selfishness

Here are six quotes to support these themes:

1. “We’re friends, and friends stick together.” (p. 23)
2. “Fear is just a feeling. It can’t hurt you.” (p. 67)
3. “The sea was a force to be reckoned with, and it demanded respect.” (p. 89)
4. “Family is everything. It’s what keeps us going.” (p. 112)
5. “Greed can make people do terrible things.” (p. 145)
6. “We’re all in this together. We have to work as a team.” (p. 178)