Abstract
Over the last two years studies have been undertaken to develop an acoustic low frequency transmitter capable of transmitting data from specialized sensors embedded up to 50 m in oceanic sedimentary formations in water depth of 5–6 km. Due to the extreme conditions of employment of this instrumentation, high impact velocities (200 km/hr), large decelerations (> 10 g) and high ambient pressures (∼ 600 bars), problems were encountered during initial tests resulting in the loss of a number of units. In order to physically recover the instrumentation for subsequent inspection, the Joint Research Centre designed and constructed a deep water high speed retrievable instrument sledge. The development of the sledge and the results of tests carried out on the M.V. TYRO are reported in the present paper.
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