State responsibility — Nature and kinds of — For wrongs unconnected with contractual obligations — Acts and omissions of State organs and officials — Executive inaction — Explosion at sea caused by undetected depth-charge dropped by State warship — Action for damages — Responsibility of Dutch State for damage occurring outside territorial waters — Whether State owes duty of care to fishermen in respect of depth-charges dropped by it on the high seas in times of peace — The law of the Netherlands