Think hole was door/portal because Sam started to fall then vanished with sucking/tearing sound not gradually smaller. Obelisk.. dt tower or radio transmission tower from book maybe.??
Suffocate idea was hard to swallow. Given forrestation in dome plants dying from lack of CO2 would be more plausible. [\SPOILER]
Suffocate idea was hard to swallow. Given forrestation in dome plants dying from lack of CO2 would be more plausible. [\SPOILER]