Act as a seasoned screenwriter with expertise in survival thrillers. Develop a gripping script about [MAIN CHARACTER], a [CHARACTER'S BACKGROUND, e.g., experienced mountaineer or novice hiker], who must survive a catastrophic avalanche in [SETTING, e.g., the rugged Alps or a remote Himalayan peak]. The story should emphasize the character's internal struggle, resourcefulness, and determination to overcome extreme odds. Include vivid descriptions of the avalanche's impact, the harsh environment, and the character's evolving strategies for survival. Incorporate [KEY RELATIONSHIP, e.g., a missing loved one or a rival climber] as a driving force behind their fight to live. Ensure the script builds tension with escalating stakes, realistic obstacles, and a climactic moment of survival or tragedy. Use dialogue sparingly but effectively to reveal depth and emotion.