| Gear used included an Isaacs-Kidd midwater trawl net, bongo net, Conductivity-Temperature-Depth probes, Expendable Bathythermograph, and a sea surface temperature recorder. |
| Nor even the fact that a network of 3,175 bathythermograph buoys have found that the heat content of the ocean has been dropping for the last five years. |
| In 1937, Spilhaus developed the bathythermograph which could provide a temperature profile to 275 m. Naval vessels are said to have taken bathythermograph casts at speeds exceeding 25 knots, but probably at some risk. |
