278 A Good Practice in the Sea (II) 6yr

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Within one day, Zhang Tie had upgraded his swimming from a doggy paddle to a freestyle.
The kelp forest was over 100 m away; however, it took Zhang Tie less than two minutes to reach the place where Zhang Keliang had pointed to by easily moving his arms in the water. He then took a deep breath before diving into the sea.
After diving deeper than 10 meters, Zhang Tie had already seen a great area of red seaweed at the bottom of the sea. They were as tall as a person and were slowly waving along with the surging seawater. The bottom of the forest was like a fire while a great shoal of finger-long silverfish was swimming around there like changing clouds, making it very beautiful.
Because there were sea serpents and not too many navy-blue iron ores here, few people would like to pick up navy-blue iron ores here. Only Zhang Tie who had a special purpose would be here.
When he drew close to the seaweeds, Zhang Tie had become very careful and started to look for his target.
Within three