Your dream presents a rich tapestry of symbols and scenarios that can be interpreted in various ways. Here are some insights into the key elements:

1. Submarine: This often represents exploration of the subconscious or deep emotions. It suggests that you are diving into your inner thoughts or feelings, perhaps seeking knowledge or understanding about yourself.
2. Rice University: This could symbolize a quest for knowledge or a new learning experience. Universities often represent growth, ambition, and intellectual pursuits.
3. Jess and Evelyn: The presence of these two figures may represent aspects of yourself or qualities you associate with them. They could symbolize friendship, teamwork, or even different perspectives you value in your life.
4. Spy Group: Being selected for a spy group may indicate feelings of being chosen for a special purpose or a desire to uncover hidden truths, whether in your life or in a situation you're currently facing.
5. Task of Gathering Information: This suggests a search for deeper understanding or clarity about something significant in your life. It may reflect your current need to gather insights before making decisions.
6. Favorite Fruit (Dragon Fruit): Fruits often symbolize rewards or the results of your efforts. The dragon fruit, known for its unique appearance, may represent something special or unique in your life that you cherish. It could also symbolize your individuality and the importance of embracing what makes you different.
7. The Old Lady: This figure could be a guide or a mentor, representing wisdom and the passage of knowledge. Her disappearance might indicate that the answers or guidance you seek may not always be easily accessible.

Overall, this dream could be encouraging you to explore your inner self and pursue knowledge while reminding you that you have support from those around you. It may also suggest that you trust your unique qualities and the information you gather as you navigate your current circumstances.

Consider what areas of your life you might be exploring or what knowledge you might be seeking at this time. This could provide further clarity on the meaning behind your dream.