Surabaya, Java, for air-raid shelters, recently dug trenches, screened them with bamboo as protection against bomb splinters and flying debris. Last week travelers from Java reported that a few weeks after the shelters were built pleased natives wrote a letter of thanks to the Government. "Thank you very much for the new W.C.s," said the letter. "We have needed them for a long time." Dutch officers hastily inspected the new shelters, found the letter was no joke.