CREATE TABLE table_38839 ("Name" CLOB, "Type" CLOB, "Entered service" CLOB, "Water depth" CLOB, "Location" CLOB)

What type entered service in 2000?
SELECT "Type" FROM table_38839 WHERE "Entered service" = '2000'
SELECT "Type" FROM "table_38839" WHERE "Entered service" = '2000'