| 摘要 |
An under ice crawler lowerable into a body of water through a hole in a layer of ice overtop is operable to extend a flexible line within the body o f water between two points spaced along the ice. The crawler features a floating bod y having sliding surfaces defined at an upper limit thereof, a motor carried o n the floating body to selectively drive a propeller, a connector carried on the floating body to facilitate the connection of the line thereto and a starting device carri ed on the floating body and actuable from thereabove. A termination device is carried on the floating body at a position distinct from that of the starting device to provide easy access. The starter device is actuable by lowering a starting-signal generat or through the hole in the ice into proximity with a starting-signal sensor carried on the float body without requiring physical contact with the receiver.
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