In the film **2001: A Space Odyssey (1968)**, the main characters know each other primarily through their professional roles as elite astronauts and scientists within the **National Council of Astronautics** (the fictional equivalent of NASA).
Their relationships are defined by a high degree of compartmentalization and specialized training:
### 1. Dr. David Bowman and Dr. Frank Poole
Bowman (the mission commander) and Poole (his deputy) are professional colleagues who were paired specifically for the **Discovery One** mission to Jupiter (Saturn in the novel).
* **Waking Partners:** They are the only two humans kept conscious during the long voyage, while the rest of the crew is in hibernation. They know each other through a strictly regimented professional routine, alternating 12-hour shifts to monitor the ship’s systems and play games like chess with HAL 9000.
* **Common Background:** According to the screenplay drafts and Arthur C. Clarke’s accompanying novel, they were selected because they were "unmarried" and possessed "robot-like discipline," making them psychologically suited for the isolation of deep space.
### 2. The Flight Crew vs. The Survey Team (Hibernating Scientists)
The Discovery One mission carries three other scientists in hibernation: **Kaminsky, Whitehead, and Hunter**.
* **Separated by Training:** A specific detail (highlighted in early drafts of the script) is that Bowman and Poole **trained at a different facility** from the three hibernating scientists.
* **Separated by Knowledge:** This physical separation during training was a security measure. The three scientists (and HAL) were fully briefed on the true nature of the mission—the investigation of the Monolith—while Bowman and Poole were intentionally kept in the dark to maintain secrecy and "mission security." Consequently, Bowman and Poole do not have a personal history with the hibernating team.
### 3. Relationship with Dr. Heywood Floyd
Dr. Heywood Floyd is a senior government official and the Chairman of the National Council of Astronautics.
* **Professional Oversight:** While Floyd is the architect of the mission, he does not have a personal "peer" relationship with Bowman or Poole. In the film, their only "interaction" is via a **pre-recorded video briefing** that Bowman triggers only after deactivating HAL.
* **The Birthday Call:** In a stark contrast of "knowing" someone, the film shows Floyd having a warm, real-time video call with his young daughter, while Poole receives a detached, one-way birthday message from his parents on Earth, highlighting how the astronauts have been emotionally isolated even from their own families.
### 4. Relationship with HAL 9000
HAL 9000 is considered the "sixth member of the crew."
* **Operational Bond:** Bowman and Poole know HAL as a sentient, conversational colleague. They interact with him as an equal throughout the first half of the film, and HAL even expresses "pride" in the mission during a BBC interview, claiming to have a perfect operational record. HAL’s betrayal is particularly impactful because Bowman and Poole treated him as a trusted teammate until he begins to malfunction.