What caused the 1970 palace coup that brought Qaboos bin Said to power?

The 1970 palace coup that brought Qaboos bin Said to power was primarily driven by the need to address the country's stagnation and the ongoing Dhofar rebellion.123

Under the rule of his father, Sa‘īd ibn Taymūr, Oman remained in a state of relative underdevelopment and isolation, despite the country's growing oil revenues. Sa‘īd maintained strict, moralistic laws and kept his son, Qaboos, in virtual confinement for six years after calling him home from his education in England.1

By the mid-1960s, a Marxist-led rebellion in the southern Dhofar region created significant instability. These security concerns, combined with the desire to modernize the nation's infrastructure and government, prompted the coup on July 23, 1970, which was carried out by Qaboos with British support. Following the successful overthrow and the subsequent exile of his father, Qaboos immediately began ambitious modernization projects and reversed the country's policy of isolation.312