Put the verbs in brackets in Present Perfect, Past Simple, Future-im-the-Past or form their  Participles, using Passive Voice where necessary 

Deep-sea exploration (reveal) many unsettling species, but none (fascinate) scientists as much as the anglerfish. The species first (shock) researchers when they observed it during an unexpected submarine encounter in 2012. The goblin shark (catch) on camera only a handful of times, which has reinforced its status as a living fossil. The first confirmed recording (appear) after a remotely operated vehicle accidentally (pass) beneath it near Japan. The barreleye fish (attract) global attention, especially because its transparent head (document) only rarely. The world first (learn) about it when MBARI scientists filmed it (move) its tubular eyes inside its dome-like skull. Several oceanographers argue that humanity (underestimate) the dangers of the deep sea, and they wonder whether future expeditions should focus more on creature behaviour than on mapping terrain. One researcher said that his team would reconsider their strategy if new evidence (emerge) about aggressive interactions among deep-sea predators. The dragonfish (describe) in recent studies as one of the most efficient hunters, and this has made experts (reassess) long-held assumptions. They originally (classify) it as a minor predator until they discovered its ability to produce red bioluminescent light. The gulper eel (puzzle) biologists for decades, as its expandable mouth (observe) only rarely. The first detailed footage (circulate) in 2018, when a camera drone filmed it inflating its enormous jaw like a balloon. Some marine institutes (announce) that they (collect) enough data for a new comparative study, though they were unsure if the results (change) the current taxonomy. However, they predicted that the study (reveal) behavioural adaptations that had previously gone unnoticed. Altogether, these creatures (force) scientists to rethink what survival means in total darkness, and their discoveries have shown how little of the deep ocean we truly (understand) until these encounters occurred.

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