The early to mid-1990s saw the continuation of Lloyd's most traumatic period in its history that had begun with the explosion on Piper Alpha. Unexpectedly large legal awards in US courts for punitive damages led to substantial claims on asbestos, pollution and health hazard (APH) policies, some dating as far back as the 1940s. Many of these policies were open-peril policies, meaning that they covered any claim not specifically excluded. Other policies (called standard, or broad) only cover stated perils, such as fire.