<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31465188</termId><termName>unmanned underwater vehicles</termName><termType>PT</termType><termNote><![CDATA[ Underwater vehicles that maneuver without humans on board. These exist in two types: remotely operated underwater vehicles (ROVs), which are tethered to and controlled by a remote operator, and autonomous underwater vehicles (AUVs), which maneuver independently of direct operator input. ]]></termNote><termCreatedDate>2026-03-30 21:05:12</termCreatedDate><relation><relationType>UF</relationType><termId>31465189</termId><termName>UUV</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31465190</termId><termName>unmanned underwater vehicle</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31449336</termId><termName>submersibles</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>31476615</termId><termName>autonomous underwater vehicles</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>31476618</termId><termName>remotely operated vehicles</termName><termType>PT</termType></relation></term>  </Zthes>