B-class submarines
... that mice were used to detect any concentrations of carbon monoxide inside the hull of the British petrol-engined B-class submarines?
... that mice were used to detect any concentrations of <a href="./Carbon_monoxide" id="mwRw" rel="mw:WikiLink" title="Carbon monoxide">carbon monoxide</a> inside the hull of the British <a href="./Petrol_engine" id="mwSA" rel="mw:WikiLink" title="Petrol engine">petrol-engined</a> <b id="mwSQ"><a class="mw-redirect" href="./British_B_class_submarine" id="mwSg" rel="mw:WikiLink" title="British B class submarine"><i id="mwSw">B</i>-class submarines</a></b>?