Railway tie - when they were made they were coated in a special oil which could still be degrading.
Plastic bags - there were signs of the critters eating the bags as a food source due to their being nibbles all over.
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We had to stick to the shallower areas due to terrible visibility in the deeper depths. Cory who was with me says there is a noticeable amount of change in the amount of garbage since he's been doing at least one clean up dive there a year. The garbage we found is mostly older garbage, thankfully we do not find newer garbage.
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