<instructions>Your goal is to analyze the following comment and estimate how highly it will be upvoted by the Hacker News community.</instructions><comment><author>gnicholas</author><text>That looks absolutely amazing. Super cool that you can maintain elevation at less than 6 MPH — I was expecting it to be closer to 10 or 15 MPH.</text><parent_chain><item><author>RajT88</author><text>Peak efficiency probably looks like this:&lt;p&gt;&lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;newatlas.com&amp;#x2F;marine&amp;#x2F;jetcycle-hydrofoil-pedal-bike&amp;#x2F;&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;newatlas.com&amp;#x2F;marine&amp;#x2F;jetcycle-hydrofoil-pedal-bike&amp;#x2F;&lt;/a&gt;</text></item><item><author>causal</author><text>Yeah I think for most uses I would still prefer fins for their agility. Cool idea though, and we probably haven&amp;#x27;t seen peak efficiency here.</text></item><item><author>pge</author><text>Interesting that the CIA conclusion for a device very similar to the article is &amp;quot;Not recommended for operational use due to its discomfort and very slight gain in speed over that of a swimmer equipped with fins.&amp;quot;</text></item><item><author>wood_spirit</author><text>It’s obscure but there was such a contraption trialled by the seals and cia in the 1950s &lt;a href=&quot;http:&amp;#x2F;&amp;#x2F;www.hisutton.com&amp;#x2F;CIA_Water-Air_1958.html&quot; rel=&quot;nofollow&quot;&gt;http:&amp;#x2F;&amp;#x2F;www.hisutton.com&amp;#x2F;CIA_Water-Air_1958.html&lt;/a&gt;&lt;p&gt;Here’s a pedal powered smuggling submarine from the 1940s &lt;a href=&quot;http:&amp;#x2F;&amp;#x2F;www.hisutton.com&amp;#x2F;Swiss-Pedal-Powered-Smuggling-Submarine.html&quot; rel=&quot;nofollow&quot;&gt;http:&amp;#x2F;&amp;#x2F;www.hisutton.com&amp;#x2F;Swiss-Pedal-Powered-Smuggling-Submar...&lt;/a&gt;</text></item></parent_chain></comment><story><title>&apos;Underwater bicycle&apos; propels swimmers forward at superhuman speed</title><url>https://newatlas.com/marine/seabike-swimming-propeller/</url></story>
<instructions>Your goal is to analyze the following comment and estimate how highly it will be upvoted by the Hacker News community.</instructions><comment><author>tigen</author><text>Looks like pretty hard work compared to land bikes. You never get to coast downhill. I wonder if you can get it to surf on waves.</text><parent_chain><item><author>RajT88</author><text>Peak efficiency probably looks like this:&lt;p&gt;&lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;newatlas.com&amp;#x2F;marine&amp;#x2F;jetcycle-hydrofoil-pedal-bike&amp;#x2F;&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;newatlas.com&amp;#x2F;marine&amp;#x2F;jetcycle-hydrofoil-pedal-bike&amp;#x2F;&lt;/a&gt;</text></item><item><author>causal</author><text>Yeah I think for most uses I would still prefer fins for their agility. Cool idea though, and we probably haven&amp;#x27;t seen peak efficiency here.</text></item><item><author>pge</author><text>Interesting that the CIA conclusion for a device very similar to the article is &amp;quot;Not recommended for operational use due to its discomfort and very slight gain in speed over that of a swimmer equipped with fins.&amp;quot;</text></item><item><author>wood_spirit</author><text>It’s obscure but there was such a contraption trialled by the seals and cia in the 1950s &lt;a href=&quot;http:&amp;#x2F;&amp;#x2F;www.hisutton.com&amp;#x2F;CIA_Water-Air_1958.html&quot; rel=&quot;nofollow&quot;&gt;http:&amp;#x2F;&amp;#x2F;www.hisutton.com&amp;#x2F;CIA_Water-Air_1958.html&lt;/a&gt;&lt;p&gt;Here’s a pedal powered smuggling submarine from the 1940s &lt;a href=&quot;http:&amp;#x2F;&amp;#x2F;www.hisutton.com&amp;#x2F;Swiss-Pedal-Powered-Smuggling-Submarine.html&quot; rel=&quot;nofollow&quot;&gt;http:&amp;#x2F;&amp;#x2F;www.hisutton.com&amp;#x2F;Swiss-Pedal-Powered-Smuggling-Submar...&lt;/a&gt;</text></item></parent_chain></comment><story><title>&apos;Underwater bicycle&apos; propels swimmers forward at superhuman speed</title><url>https://newatlas.com/marine/seabike-swimming-propeller/</url></story>