Where is Transocean Richardson, a semi entered into service in 1988?
CREATE TABLE "deepwater" (
  "name" text,
  "type" text,
  "entered_service" text,
  "water_depth" text,
  "location" text
);
SELECT "location" FROM "deepwater" WHERE "type"='semi' AND "entered_service"='1988' AND "name"='transocean richardson';